wcslib (8.2.2)
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<a href="spc_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno"> 1</span><span class="comment">/*============================================================================</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno"> 2</span><span class="comment"> WCSLIB 8.2 - an implementation of the FITS WCS standard.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno"> 3</span><span class="comment"> Copyright (C) 1995-2023, Mark Calabretta</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno"> 4</span><span class="comment"></span> </div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno"> 5</span><span class="comment"> This file is part of WCSLIB.</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno"> 6</span><span class="comment"></span> </div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno"> 7</span><span class="comment"> WCSLIB is free software: you can redistribute it and/or modify it under the</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno"> 8</span><span class="comment"> terms of the GNU Lesser General Public License as published by the Free</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno"> 9</span><span class="comment"> Software Foundation, either version 3 of the License, or (at your option)</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"> 10</span><span class="comment"> any later version.</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno"> 11</span><span class="comment"></span> </div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno"> 12</span><span class="comment"> WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno"> 13</span><span class="comment"> WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno"> 14</span><span class="comment"> FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno"> 15</span><span class="comment"> more details.</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno"> 16</span><span class="comment"></span> </div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno"> 17</span><span class="comment"> You should have received a copy of the GNU Lesser General Public License</span></div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno"> 18</span><span class="comment"> along with WCSLIB. If not, see http://www.gnu.org/licenses.</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno"> 19</span><span class="comment"></span> </div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"> 20</span><span class="comment"> Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.</span></div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno"> 21</span><span class="comment"> http://www.atnf.csiro.au/people/Mark.Calabretta</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno"> 22</span><span class="comment"> $Id: spc.h,v 8.2.1.1 2023/11/16 10:05:57 mcalabre Exp mcalabre $</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno"> 23</span><span class="comment">*=============================================================================</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno"> 24</span><span class="comment">*</span></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno"> 25</span><span class="comment">* WCSLIB 8.2 - C routines that implement the FITS World Coordinate System</span></div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"> 26</span><span class="comment">* (WCS) standard. Refer to the README file provided with WCSLIB for an</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno"> 27</span><span class="comment">* overview of the library.</span></div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno"> 28</span><span class="comment">*</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno"> 29</span><span class="comment">*</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno"> 30</span><span class="comment">* Summary of the spc routines</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno"> 31</span><span class="comment">* ---------------------------</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno"> 32</span><span class="comment">* Routines in this suite implement the part of the FITS World Coordinate</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="comment">* System (WCS) standard that deals with spectral coordinates, as described in</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno"> 34</span><span class="comment">*</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"> 35</span><span class="comment">= "Representations of world coordinates in FITS",</span></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"> 36</span><span class="comment">= Greisen, E.W., & Calabretta, M.R. 2002, A&A, 395, 1061 (WCS Paper I)</span></div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno"> 37</span><span class="comment">=</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno"> 38</span><span class="comment">= "Representations of spectral coordinates in FITS",</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment">= Greisen, E.W., Calabretta, M.R., Valdes, F.G., & Allen, S.L.</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="comment">= 2006, A&A, 446, 747 (WCS Paper III)</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment">*</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment">* These routines define methods to be used for computing spectral world</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment">* coordinates from intermediate world coordinates (a linear transformation</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="comment">* of image pixel coordinates), and vice versa. They are based on the spcprm</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="comment">* struct which contains all information needed for the computations. The</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="comment">* struct contains some members that must be set by the user, and others that</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="comment">* are maintained by these routines, somewhat like a C++ class but with no</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="comment">* encapsulation.</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno"> 49</span><span class="comment">*</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno"> 50</span><span class="comment">* Routine spcini() is provided to initialize the spcprm struct with default</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="comment">* values, spcfree() reclaims any memory that may have been allocated to store</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="comment">* an error message, spcsize() computes its total size including allocated</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="comment">* memory, and spcprt() prints its contents.</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno"> 54</span><span class="comment">*</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno"> 55</span><span class="comment">* spcperr() prints the error message(s) (if any) stored in a spcprm struct.</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno"> 56</span><span class="comment">*</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno"> 57</span><span class="comment">* A setup routine, spcset(), computes intermediate values in the spcprm struct</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="comment">* from parameters in it that were supplied by the user. The struct always</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span><span class="comment">* needs to be set up by spcset() but it need not be called explicitly - refer</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="comment">* to the explanation of spcprm::flag.</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="comment">*</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="comment">* spcx2s() and spcs2x() implement the WCS spectral coordinate transformations.</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span><span class="comment">* In fact, they are high level driver routines for the lower level spectral</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span><span class="comment">* coordinate transformation routines described in spx.h.</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno"> 65</span><span class="comment">*</span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno"> 66</span><span class="comment">* A number of routines are provided to aid in analysing or synthesising sets</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span><span class="comment">* of FITS spectral axis keywords:</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span><span class="comment">*</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span><span class="comment">* - spctype() checks a spectral CTYPEia keyword for validity and returns</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="comment">* information derived from it.</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno"> 71</span><span class="comment">*</span></div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno"> 72</span><span class="comment">* - Spectral keyword analysis routine spcspxe() computes the values of the</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="comment">* X-type spectral variables for the S-type variables supplied.</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="comment">*</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="comment">* - Spectral keyword synthesis routine, spcxpse(), computes the S-type</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="comment">* variables for the X-types supplied.</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span><span class="comment">*</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span><span class="comment">* - Given a set of spectral keywords, a translation routine, spctrne(),</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="comment">* produces the corresponding set for the specified spectral CTYPEia.</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="comment">*</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span><span class="comment">* - spcaips() translates AIPS-convention spectral CTYPEia and VELREF</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span><span class="comment">* keyvalues.</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span><span class="comment">*</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span><span class="comment">* Spectral variable types - S, P, and X:</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno"> 85</span><span class="comment">* --------------------------------------</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"> 86</span><span class="comment">* A few words of explanation are necessary regarding spectral variable types</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span><span class="comment">* in FITS.</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span><span class="comment">*</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span><span class="comment">* Every FITS spectral axis has three associated spectral variables:</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span><span class="comment">*</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span><span class="comment">* S-type: the spectral variable in which coordinates are to be</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="comment">* expressed. Each S-type is encoded as four characters and is</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><span class="comment">* linearly related to one of four basic types as follows:</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno"> 94</span><span class="comment">*</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno"> 95</span><span class="comment">* F (Frequency):</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span><span class="comment">* - 'FREQ': frequency</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span><span class="comment">* - 'AFRQ': angular frequency</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span><span class="comment">* - 'ENER': photon energy</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span><span class="comment">* - 'WAVN': wave number</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span><span class="comment">* - 'VRAD': radio velocity</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span><span class="comment">*</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span><span class="comment">* W (Wavelength in vacuo):</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span><span class="comment">* - 'WAVE': wavelength</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span><span class="comment">* - 'VOPT': optical velocity</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span><span class="comment">* - 'ZOPT': redshift</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span><span class="comment">*</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span><span class="comment">* A (wavelength in Air):</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span><span class="comment">* - 'AWAV': wavelength in air</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno"> 109</span><span class="comment">*</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno"> 110</span><span class="comment">* V (Velocity):</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span><span class="comment">* - 'VELO': relativistic velocity</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span><span class="comment">* - 'BETA': relativistic beta factor</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><span class="comment">*</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span><span class="comment">* The S-type forms the first four characters of the CTYPEia keyvalue,</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span><span class="comment">* and CRVALia and CDELTia are expressed as S-type quantities so that</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span><span class="comment">* they provide a first-order approximation to the S-type variable at</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span><span class="comment">* the reference point.</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno"> 118</span><span class="comment">*</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno"> 119</span><span class="comment">* Note that 'AFRQ', angular frequency, is additional to the variables</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span><span class="comment">* defined in WCS Paper III.</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"> 121</span><span class="comment">*</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno"> 122</span><span class="comment">* P-type: the basic spectral variable (F, W, A, or V) with which the</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span><span class="comment">* S-type variable is associated (see list above).</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span><span class="comment">*</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span><span class="comment">* For non-grism axes, the P-type is encoded as the eighth character of</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span><span class="comment">* CTYPEia.</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno"> 127</span><span class="comment">*</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno"> 128</span><span class="comment">* X-type: the basic spectral variable (F, W, A, or V) for which the</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span><span class="comment">* spectral axis is linear, grisms excluded (see below).</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno"> 130</span><span class="comment">*</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno"> 131</span><span class="comment">* For non-grism axes, the X-type is encoded as the sixth character of</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span><span class="comment">* CTYPEia.</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span><span class="comment">*</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span><span class="comment">* Grisms: Grism axes have normal S-, and P-types but the axis is linear,</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span><span class="comment">* not in any spectral variable, but in a special "grism parameter".</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span><span class="comment">* The X-type spectral variable is either W or A for grisms in vacuo or</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span><span class="comment">* air respectively, but is encoded as 'w' or 'a' to indicate that an</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span><span class="comment">* additional transformation is required to convert to or from the</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span><span class="comment">* grism parameter. The spectral algorithm code for grisms also has a</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span><span class="comment">* special encoding in CTYPEia, either 'GRI' (in vacuo) or 'GRA' (in air).</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span><span class="comment">*</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span><span class="comment">* In the algorithm chain, the non-linear transformation occurs between the</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span><span class="comment">* X-type and the P-type variables; the transformation between P-type and</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span><span class="comment">* S-type variables is always linear.</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span><span class="comment">*</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span><span class="comment">* When the P-type and X-type variables are the same, the spectral axis is</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span><span class="comment">* linear in the S-type variable and the second four characters of CTYPEia</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span><span class="comment">* are blank. This can never happen for grism axes.</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno"> 149</span><span class="comment">*</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"> 150</span><span class="comment">* As an example, correlating radio spectrometers always produce spectra that</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span><span class="comment">* are regularly gridded in frequency; a redshift scale on such a spectrum is</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span><span class="comment">* non-linear. The required value of CTYPEia would be 'ZOPT-F2W', where the</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span><span class="comment">* desired S-type is 'ZOPT' (redshift), the P-type is necessarily 'W'</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span><span class="comment">* (wavelength), and the X-type is 'F' (frequency) by the nature of the</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span><span class="comment">* instrument.</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span><span class="comment">*</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span><span class="comment">* Air-to-vacuum wavelength conversion:</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno"> 158</span><span class="comment">* ------------------------------------</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno"> 159</span><span class="comment">* Please refer to the prologue of spx.h for important comments relating to the</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span><span class="comment">* air-to-vacuum wavelength conversion.</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span><span class="comment">*</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span><span class="comment">* Argument checking:</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span><span class="comment">* ------------------</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span><span class="comment">* The input spectral values are only checked for values that would result in</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span><span class="comment">* floating point exceptions. In particular, negative frequencies and</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span><span class="comment">* wavelengths are allowed, as are velocities greater than the speed of</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span><span class="comment">* light. The same is true for the spectral parameters - rest frequency and</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span><span class="comment">* wavelength.</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span><span class="comment">*</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span><span class="comment">* Accuracy:</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"> 171</span><span class="comment">* ---------</span></div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno"> 172</span><span class="comment">* No warranty is given for the accuracy of these routines (refer to the</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span><span class="comment">* copyright notice); intending users must satisfy for themselves their</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span><span class="comment">* adequacy for the intended purpose. However, closure effectively to within</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span><span class="comment">* double precision rounding error was demonstrated by test routine tspc.c</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span><span class="comment">* which accompanies this software.</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span><span class="comment">*</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span><span class="comment">*</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span><span class="comment">* spcini() - Default constructor for the spcprm struct</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span><span class="comment">* ----------------------------------------------------</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span><span class="comment">* spcini() sets all members of a spcprm struct to default values. It should</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span><span class="comment">* be used to initialize every spcprm struct.</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span><span class="comment">*</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span><span class="comment">* PLEASE NOTE: If the spcprm struct has already been initialized, then before</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span><span class="comment">* reinitializing, it spcfree() should be used to free any memory that may have</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span><span class="comment">* been allocated to store an error message. A memory leak may otherwise</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span><span class="comment">* result.</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span><span class="comment">*</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span><span class="comment">* spc struct spcprm*</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span><span class="comment">* Spectral transformation parameters.</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span><span class="comment">*</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span><span class="comment">* 1: Null spcprm pointer passed.</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span><span class="comment">*</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span><span class="comment">*</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span><span class="comment">* spcfree() - Destructor for the spcprm struct</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span><span class="comment">* --------------------------------------------</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span><span class="comment">* spcfree() frees any memory that may have been allocated to store an error</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span><span class="comment">* message in the spcprm struct.</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span><span class="comment">*</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span><span class="comment">* spc struct spcprm*</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span><span class="comment">* Spectral transformation parameters.</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno"> 207</span><span class="comment">*</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno"> 208</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span><span class="comment">* 1: Null spcprm pointer passed.</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span><span class="comment">*</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span><span class="comment">*</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span><span class="comment">* spcsize() - Compute the size of a spcprm struct</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span><span class="comment">* -----------------------------------------------</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span><span class="comment">* spcsize() computes the full size of a spcprm struct, including allocated</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span><span class="comment">* memory.</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno"> 218</span><span class="comment">*</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno"> 219</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span><span class="comment">* spc const struct spcprm*</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span><span class="comment">* Spectral transformation parameters.</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span><span class="comment">*</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span><span class="comment">* If NULL, the base size of the struct and the allocated</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span><span class="comment">* size are both set to zero.</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span><span class="comment">*</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span><span class="comment">* sizes int[2] The first element is the base size of the struct as</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span><span class="comment">* returned by sizeof(struct spcprm). The second element</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span><span class="comment">* is the total allocated size, in bytes. This figure</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span><span class="comment">* includes memory allocated for the constituent struct,</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span><span class="comment">* spcprm::err.</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno"> 232</span><span class="comment">*</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"> 233</span><span class="comment">* It is not an error for the struct not to have been set</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span><span class="comment">* up via spcset().</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"> 235</span><span class="comment">*</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno"> 239</span><span class="comment">*</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno"> 240</span><span class="comment">*</span></div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno"> 241</span><span class="comment">* spcprt() - Print routine for the spcprm struct</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno"> 242</span><span class="comment">* ----------------------------------------------</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"> 243</span><span class="comment">* spcprt() prints the contents of a spcprm struct using wcsprintf(). Mainly</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span><span class="comment">* intended for diagnostic purposes.</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span><span class="comment">*</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span><span class="comment">* spc const struct spcprm*</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span><span class="comment">* Spectral transformation parameters.</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno"> 249</span><span class="comment">*</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"> 250</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"> 251</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno"> 252</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"> 253</span><span class="comment">* 1: Null spcprm pointer passed.</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno"> 254</span><span class="comment">*</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno"> 255</span><span class="comment">*</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno"> 256</span><span class="comment">* spcperr() - Print error messages from a spcprm struct</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno"> 257</span><span class="comment">* -----------------------------------------------------</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"> 258</span><span class="comment">* spcperr() prints the error message(s) (if any) stored in a spcprm struct.</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"> 259</span><span class="comment">* If there are no errors then nothing is printed. It uses wcserr_prt(), q.v.</span></div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno"> 260</span><span class="comment">*</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno"> 261</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno"> 262</span><span class="comment">* spc const struct spcprm*</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span><span class="comment">* Spectral transformation parameters.</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno"> 264</span><span class="comment">*</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno"> 265</span><span class="comment">* prefix const char *</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno"> 266</span><span class="comment">* If non-NULL, each output line will be prefixed with</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"> 267</span><span class="comment">* this string.</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno"> 268</span><span class="comment">*</span></div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span><span class="comment">* 1: Null spcprm pointer passed.</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span><span class="comment">*</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"> 274</span><span class="comment">*</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno"> 275</span><span class="comment">* spcset() - Setup routine for the spcprm struct</span></div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno"> 276</span><span class="comment">* ----------------------------------------------</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno"> 277</span><span class="comment">* spcset() sets up a spcprm struct according to information supplied within</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno"> 278</span><span class="comment">* it.</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span><span class="comment">*</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span><span class="comment">* Note that this routine need not be called directly; it will be invoked by</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno"> 281</span><span class="comment">* spcx2s() and spcs2x() if spcprm::flag is anything other than a predefined</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span><span class="comment">* magic value.</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span><span class="comment">*</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno"> 284</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"> 285</span><span class="comment">* spc struct spcprm*</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span><span class="comment">* Spectral transformation parameters.</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span><span class="comment">*</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno"> 289</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno"> 290</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno"> 291</span><span class="comment">* 1: Null spcprm pointer passed.</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno"> 292</span><span class="comment">* 2: Invalid spectral parameters.</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"> 293</span><span class="comment">*</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno"> 294</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span><span class="comment">* spcprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"> 296</span><span class="comment">*</span></div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno"> 297</span><span class="comment">*</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno"> 298</span><span class="comment">* spcx2s() - Transform to spectral coordinates</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span><span class="comment">* --------------------------------------------</span></div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span><span class="comment">* spcx2s() transforms intermediate world coordinates to spectral coordinates.</span></div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"> 301</span><span class="comment">*</span></div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno"> 302</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"> 303</span><span class="comment">* spc struct spcprm*</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"> 304</span><span class="comment">* Spectral transformation parameters.</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno"> 305</span><span class="comment">*</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"> 306</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"> 307</span><span class="comment">* nx int Vector length.</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno"> 308</span><span class="comment">*</span></div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno"> 309</span><span class="comment">* sx int Vector stride.</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno"> 310</span><span class="comment">*</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno"> 311</span><span class="comment">* sspec int Vector stride.</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno"> 312</span><span class="comment">*</span></div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno"> 313</span><span class="comment">* x const double[]</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno"> 314</span><span class="comment">* Intermediate world coordinates, in SI units.</span></div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno"> 315</span><span class="comment">*</span></div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno"> 316</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno"> 317</span><span class="comment">* spec double[] Spectral coordinates, in SI units.</span></div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno"> 318</span><span class="comment">*</span></div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno"> 319</span><span class="comment">* stat int[] Status return value status for each vector element:</span></div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno"> 320</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno"> 321</span><span class="comment">* 1: Invalid value of x.</span></div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno"> 322</span><span class="comment">*</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno"> 323</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno"> 324</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno"> 325</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno"> 326</span><span class="comment">* 1: Null spcprm pointer passed.</span></div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno"> 327</span><span class="comment">* 2: Invalid spectral parameters.</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno"> 328</span><span class="comment">* 3: One or more of the x coordinates were invalid,</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno"> 329</span><span class="comment">* as indicated by the stat vector.</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno"> 330</span><span class="comment">*</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno"> 331</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno"> 332</span><span class="comment">* spcprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno"> 333</span><span class="comment">*</span></div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno"> 334</span><span class="comment">*</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno"> 335</span><span class="comment">* spcs2x() - Transform spectral coordinates</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno"> 336</span><span class="comment">* -----------------------------------------</span></div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno"> 337</span><span class="comment">* spcs2x() transforms spectral world coordinates to intermediate world</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno"> 338</span><span class="comment">* coordinates.</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno"> 339</span><span class="comment">*</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno"> 340</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno"> 341</span><span class="comment">* spc struct spcprm*</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno"> 342</span><span class="comment">* Spectral transformation parameters.</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno"> 343</span><span class="comment">*</span></div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno"> 344</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno"> 345</span><span class="comment">* nspec int Vector length.</span></div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno"> 346</span><span class="comment">*</span></div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno"> 347</span><span class="comment">* sspec int Vector stride.</span></div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno"> 348</span><span class="comment">*</span></div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno"> 349</span><span class="comment">* sx int Vector stride.</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno"> 350</span><span class="comment">*</span></div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno"> 351</span><span class="comment">* spec const double[]</span></div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno"> 352</span><span class="comment">* Spectral coordinates, in SI units.</span></div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno"> 353</span><span class="comment">*</span></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno"> 354</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno"> 355</span><span class="comment">* x double[] Intermediate world coordinates, in SI units.</span></div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno"> 356</span><span class="comment">*</span></div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno"> 357</span><span class="comment">* stat int[] Status return value status for each vector element:</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno"> 358</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno"> 359</span><span class="comment">* 1: Invalid value of spec.</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno"> 360</span><span class="comment">*</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno"> 361</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno"> 362</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno"> 363</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno"> 364</span><span class="comment">* 1: Null spcprm pointer passed.</span></div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno"> 365</span><span class="comment">* 2: Invalid spectral parameters.</span></div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno"> 366</span><span class="comment">* 4: One or more of the spec coordinates were</span></div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno"> 367</span><span class="comment">* invalid, as indicated by the stat vector.</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno"> 368</span><span class="comment">*</span></div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno"> 369</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno"> 370</span><span class="comment">* spcprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno"> 371</span><span class="comment">*</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno"> 372</span><span class="comment">*</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno"> 373</span><span class="comment">* spctype() - Spectral CTYPEia keyword analysis</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno"> 374</span><span class="comment">* ---------------------------------------------</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno"> 375</span><span class="comment">* spctype() checks whether a CTYPEia keyvalue is a valid spectral axis type</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno"> 376</span><span class="comment">* and if so returns information derived from it relating to the associated S-,</span></div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno"> 377</span><span class="comment">* P-, and X-type spectral variables (see explanation above).</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno"> 378</span><span class="comment">*</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno"> 379</span><span class="comment">* The return arguments are guaranteed not be modified if CTYPEia is not a</span></div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno"> 380</span><span class="comment">* valid spectral type; zero-pointers may be specified for any that are not of</span></div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno"> 381</span><span class="comment">* interest.</span></div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno"> 382</span><span class="comment">*</span></div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno"> 383</span><span class="comment">* A deprecated form of this function, spctyp(), lacks the wcserr** parameter.</span></div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno"> 384</span><span class="comment">*</span></div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno"> 385</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno"> 386</span><span class="comment">* ctype const char[9]</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno"> 387</span><span class="comment">* The CTYPEia keyvalue, (eight characters with null</span></div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"> 388</span><span class="comment">* termination).</span></div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno"> 389</span><span class="comment">*</span></div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno"> 390</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno"> 391</span><span class="comment">* stype char[] The four-letter name of the S-type spectral variable</span></div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno"> 392</span><span class="comment">* copied or translated from ctype. If a non-zero</span></div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno"> 393</span><span class="comment">* pointer is given, the array must accomodate a null-</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"> 394</span><span class="comment">* terminated string of length 5.</span></div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno"> 395</span><span class="comment">*</span></div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno"> 396</span><span class="comment">* scode char[] The three-letter spectral algorithm code copied or</span></div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno"> 397</span><span class="comment">* translated from ctype. Logarithmic ('LOG') and</span></div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno"> 398</span><span class="comment">* tabular ('TAB') codes are also recognized. If a</span></div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno"> 399</span><span class="comment">* non-zero pointer is given, the array must accomodate a</span></div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno"> 400</span><span class="comment">* null-terminated string of length 4.</span></div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno"> 401</span><span class="comment">*</span></div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno"> 402</span><span class="comment">* sname char[] Descriptive name of the S-type spectral variable.</span></div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno"> 403</span><span class="comment">* If a non-zero pointer is given, the array must</span></div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno"> 404</span><span class="comment">* accomodate a null-terminated string of length 22.</span></div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno"> 405</span><span class="comment">*</span></div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno"> 406</span><span class="comment">* units char[] SI units of the S-type spectral variable. If a</span></div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno"> 407</span><span class="comment">* non-zero pointer is given, the array must accomodate a</span></div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno"> 408</span><span class="comment">* null-terminated string of length 8.</span></div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno"> 409</span><span class="comment">*</span></div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno"> 410</span><span class="comment">* ptype char* Character code for the P-type spectral variable</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno"> 411</span><span class="comment">* derived from ctype, one of 'F', 'W', 'A', or 'V'.</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno"> 412</span><span class="comment">*</span></div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno"> 413</span><span class="comment">* xtype char* Character code for the X-type spectral variable</span></div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno"> 414</span><span class="comment">* derived from ctype, one of 'F', 'W', 'A', or 'V'.</span></div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno"> 415</span><span class="comment">* Also, 'w' and 'a' are synonymous to 'W' and 'A' for</span></div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno"> 416</span><span class="comment">* grisms in vacuo and air respectively. Set to 'L' or</span></div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno"> 417</span><span class="comment">* 'T' for logarithmic ('LOG') and tabular ('TAB') axes.</span></div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno"> 418</span><span class="comment">*</span></div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno"> 419</span><span class="comment">* restreq int* Multivalued flag that indicates whether rest</span></div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno"> 420</span><span class="comment">* frequency or wavelength is required to compute</span></div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno"> 421</span><span class="comment">* spectral variables for this CTYPEia:</span></div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno"> 422</span><span class="comment">* 0: Not required.</span></div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno"> 423</span><span class="comment">* 1: Required for the conversion between S- and</span></div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno"> 424</span><span class="comment">* P-types (e.g. 'ZOPT-F2W').</span></div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno"> 425</span><span class="comment">* 2: Required for the conversion between P- and</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno"> 426</span><span class="comment">* X-types (e.g. 'BETA-W2V').</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno"> 427</span><span class="comment">* 3: Required for the conversion between S- and</span></div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno"> 428</span><span class="comment">* P-types, and between P- and X-types, but not</span></div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno"> 429</span><span class="comment">* between S- and X-types (this applies only for</span></div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno"> 430</span><span class="comment">* 'VRAD-V2F', 'VOPT-V2W', and 'ZOPT-V2W').</span></div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno"> 431</span><span class="comment">* Thus the rest frequency or wavelength is required for</span></div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno"> 432</span><span class="comment">* spectral coordinate computations (i.e. between S- and</span></div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno"> 433</span><span class="comment">* X-types) only if restreq%3 != 0.</span></div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno"> 434</span><span class="comment">*</span></div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno"> 435</span><span class="comment">* err struct wcserr **</span></div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno"> 436</span><span class="comment">* If enabled, for function return values > 1, this</span></div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno"> 437</span><span class="comment">* struct will contain a detailed error message, see</span></div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno"> 438</span><span class="comment">* wcserr_enable(). May be NULL if an error message is</span></div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno"> 439</span><span class="comment">* not desired. Otherwise, the user is responsible for</span></div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno"> 440</span><span class="comment">* deleting the memory allocated for the wcserr struct.</span></div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno"> 441</span><span class="comment">*</span></div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno"> 442</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno"> 443</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno"> 444</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno"> 445</span><span class="comment">* 2: Invalid spectral parameters (not a spectral</span></div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno"> 446</span><span class="comment">* CTYPEia).</span></div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno"> 447</span><span class="comment">*</span></div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno"> 448</span><span class="comment">*</span></div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno"> 449</span><span class="comment">* spcspxe() - Spectral keyword analysis</span></div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno"> 450</span><span class="comment">* ------------------------------------</span></div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno"> 451</span><span class="comment">* spcspxe() analyses the CTYPEia and CRVALia FITS spectral axis keyword values</span></div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno"> 452</span><span class="comment">* and returns information about the associated X-type spectral variable.</span></div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno"> 453</span><span class="comment">*</span></div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno"> 454</span><span class="comment">* A deprecated form of this function, spcspx(), lacks the wcserr** parameter.</span></div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno"> 455</span><span class="comment">*</span></div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno"> 456</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno"> 457</span><span class="comment">* ctypeS const char[9]</span></div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno"> 458</span><span class="comment">* Spectral axis type, i.e. the CTYPEia keyvalue, (eight</span></div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno"> 459</span><span class="comment">* characters with null termination). For non-grism</span></div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno"> 460</span><span class="comment">* axes, the character code for the P-type spectral</span></div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno"> 461</span><span class="comment">* variable in the algorithm code (i.e. the eighth</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno"> 462</span><span class="comment">* character of CTYPEia) may be set to '?' (it will not</span></div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno"> 463</span><span class="comment">* be reset).</span></div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno"> 464</span><span class="comment">*</span></div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno"> 465</span><span class="comment">* crvalS double Value of the S-type spectral variable at the reference</span></div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno"> 466</span><span class="comment">* point, i.e. the CRVALia keyvalue, SI units.</span></div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno"> 467</span><span class="comment">*</span></div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno"> 468</span><span class="comment">* restfrq,</span></div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno"> 469</span><span class="comment">* restwav double Rest frequency [Hz] and rest wavelength in vacuo [m],</span></div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno"> 470</span><span class="comment">* only one of which need be given, the other should be</span></div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno"> 471</span><span class="comment">* set to zero.</span></div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno"> 472</span><span class="comment">*</span></div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno"> 473</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno"> 474</span><span class="comment">* ptype char* Character code for the P-type spectral variable</span></div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno"> 475</span><span class="comment">* derived from ctypeS, one of 'F', 'W', 'A', or 'V'.</span></div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno"> 476</span><span class="comment">*</span></div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno"> 477</span><span class="comment">* xtype char* Character code for the X-type spectral variable</span></div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno"> 478</span><span class="comment">* derived from ctypeS, one of 'F', 'W', 'A', or 'V'.</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno"> 479</span><span class="comment">* Also, 'w' and 'a' are synonymous to 'W' and 'A' for</span></div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno"> 480</span><span class="comment">* grisms in vacuo and air respectively; crvalX and dXdS</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno"> 481</span><span class="comment">* (see below) will conform to these.</span></div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno"> 482</span><span class="comment">*</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno"> 483</span><span class="comment">* restreq int* Multivalued flag that indicates whether rest frequency</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno"> 484</span><span class="comment">* or wavelength is required to compute spectral</span></div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno"> 485</span><span class="comment">* variables for this CTYPEia, as for spctype().</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno"> 486</span><span class="comment">*</span></div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno"> 487</span><span class="comment">* crvalX double* Value of the X-type spectral variable at the reference</span></div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno"> 488</span><span class="comment">* point, SI units.</span></div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"> 489</span><span class="comment">*</span></div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno"> 490</span><span class="comment">* dXdS double* The derivative, dX/dS, evaluated at the reference</span></div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno"> 491</span><span class="comment">* point, SI units. Multiply the CDELTia keyvalue by</span></div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno"> 492</span><span class="comment">* this to get the pixel spacing in the X-type spectral</span></div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno"> 493</span><span class="comment">* coordinate.</span></div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno"> 494</span><span class="comment">*</span></div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno"> 495</span><span class="comment">* err struct wcserr **</span></div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno"> 496</span><span class="comment">* If enabled, for function return values > 1, this</span></div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno"> 497</span><span class="comment">* struct will contain a detailed error message, see</span></div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno"> 498</span><span class="comment">* wcserr_enable(). May be NULL if an error message is</span></div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno"> 499</span><span class="comment">* not desired. Otherwise, the user is responsible for</span></div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno"> 500</span><span class="comment">* deleting the memory allocated for the wcserr struct.</span></div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno"> 501</span><span class="comment">*</span></div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno"> 502</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno"> 503</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno"> 504</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno"> 505</span><span class="comment">* 2: Invalid spectral parameters.</span></div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno"> 506</span><span class="comment">*</span></div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno"> 507</span><span class="comment">*</span></div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno"> 508</span><span class="comment">* spcxpse() - Spectral keyword synthesis</span></div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno"> 509</span><span class="comment">* -------------------------------------</span></div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno"> 510</span><span class="comment">* spcxpse(), for the spectral axis type specified and the value provided for</span></div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno"> 511</span><span class="comment">* the X-type spectral variable at the reference point, deduces the value of</span></div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno"> 512</span><span class="comment">* the FITS spectral axis keyword CRVALia and also the derivative dS/dX which</span></div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno"> 513</span><span class="comment">* may be used to compute CDELTia. See above for an explanation of the S-,</span></div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno"> 514</span><span class="comment">* P-, and X-type spectral variables.</span></div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno"> 515</span><span class="comment">*</span></div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno"> 516</span><span class="comment">* A deprecated form of this function, spcxps(), lacks the wcserr** parameter.</span></div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno"> 517</span><span class="comment">*</span></div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno"> 518</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno"> 519</span><span class="comment">* ctypeS const char[9]</span></div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno"> 520</span><span class="comment">* The required spectral axis type, i.e. the CTYPEia</span></div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno"> 521</span><span class="comment">* keyvalue, (eight characters with null termination).</span></div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno"> 522</span><span class="comment">* For non-grism axes, the character code for the P-type</span></div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno"> 523</span><span class="comment">* spectral variable in the algorithm code (i.e. the</span></div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno"> 524</span><span class="comment">* eighth character of CTYPEia) may be set to '?' (it</span></div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno"> 525</span><span class="comment">* will not be reset).</span></div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno"> 526</span><span class="comment">*</span></div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno"> 527</span><span class="comment">* crvalX double Value of the X-type spectral variable at the reference</span></div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno"> 528</span><span class="comment">* point (N.B. NOT the CRVALia keyvalue), SI units.</span></div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno"> 529</span><span class="comment">*</span></div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno"> 530</span><span class="comment">* restfrq,</span></div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno"> 531</span><span class="comment">* restwav double Rest frequency [Hz] and rest wavelength in vacuo [m],</span></div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno"> 532</span><span class="comment">* only one of which need be given, the other should be</span></div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno"> 533</span><span class="comment">* set to zero.</span></div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno"> 534</span><span class="comment">*</span></div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno"> 535</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno"> 536</span><span class="comment">* ptype char* Character code for the P-type spectral variable</span></div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno"> 537</span><span class="comment">* derived from ctypeS, one of 'F', 'W', 'A', or 'V'.</span></div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno"> 538</span><span class="comment">*</span></div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno"> 539</span><span class="comment">* xtype char* Character code for the X-type spectral variable</span></div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno"> 540</span><span class="comment">* derived from ctypeS, one of 'F', 'W', 'A', or 'V'.</span></div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno"> 541</span><span class="comment">* Also, 'w' and 'a' are synonymous to 'W' and 'A' for</span></div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno"> 542</span><span class="comment">* grisms; crvalX and cdeltX must conform to these.</span></div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno"> 543</span><span class="comment">*</span></div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno"> 544</span><span class="comment">* restreq int* Multivalued flag that indicates whether rest frequency</span></div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno"> 545</span><span class="comment">* or wavelength is required to compute spectral</span></div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno"> 546</span><span class="comment">* variables for this CTYPEia, as for spctype().</span></div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno"> 547</span><span class="comment">*</span></div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno"> 548</span><span class="comment">* crvalS double* Value of the S-type spectral variable at the reference</span></div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno"> 549</span><span class="comment">* point (i.e. the appropriate CRVALia keyvalue), SI</span></div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno"> 550</span><span class="comment">* units.</span></div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno"> 551</span><span class="comment">*</span></div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno"> 552</span><span class="comment">* dSdX double* The derivative, dS/dX, evaluated at the reference</span></div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno"> 553</span><span class="comment">* point, SI units. Multiply this by the pixel spacing</span></div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno"> 554</span><span class="comment">* in the X-type spectral coordinate to get the CDELTia</span></div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno"> 555</span><span class="comment">* keyvalue.</span></div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno"> 556</span><span class="comment">*</span></div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno"> 557</span><span class="comment">* err struct wcserr **</span></div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno"> 558</span><span class="comment">* If enabled, for function return values > 1, this</span></div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno"> 559</span><span class="comment">* struct will contain a detailed error message, see</span></div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno"> 560</span><span class="comment">* wcserr_enable(). May be NULL if an error message is</span></div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno"> 561</span><span class="comment">* not desired. Otherwise, the user is responsible for</span></div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno"> 562</span><span class="comment">* deleting the memory allocated for the wcserr struct.</span></div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno"> 563</span><span class="comment">*</span></div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno"> 564</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno"> 565</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno"> 566</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno"> 567</span><span class="comment">* 2: Invalid spectral parameters.</span></div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno"> 568</span><span class="comment">*</span></div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno"> 569</span><span class="comment">*</span></div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno"> 570</span><span class="comment">* spctrne() - Spectral keyword translation</span></div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno"> 571</span><span class="comment">* ---------------------------------------</span></div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno"> 572</span><span class="comment">* spctrne() translates a set of FITS spectral axis keywords into the</span></div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno"> 573</span><span class="comment">* corresponding set for the specified spectral axis type. For example, a</span></div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno"> 574</span><span class="comment">* 'FREQ' axis may be translated into 'ZOPT-F2W' and vice versa.</span></div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno"> 575</span><span class="comment">*</span></div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno"> 576</span><span class="comment">* A deprecated form of this function, spctrn(), lacks the wcserr** parameter.</span></div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno"> 577</span><span class="comment">*</span></div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno"> 578</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno"> 579</span><span class="comment">* ctypeS1 const char[9]</span></div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno"> 580</span><span class="comment">* Spectral axis type, i.e. the CTYPEia keyvalue, (eight</span></div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno"> 581</span><span class="comment">* characters with null termination). For non-grism</span></div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno"> 582</span><span class="comment">* axes, the character code for the P-type spectral</span></div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno"> 583</span><span class="comment">* variable in the algorithm code (i.e. the eighth</span></div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno"> 584</span><span class="comment">* character of CTYPEia) may be set to '?' (it will not</span></div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno"> 585</span><span class="comment">* be reset).</span></div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno"> 586</span><span class="comment">*</span></div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno"> 587</span><span class="comment">* crvalS1 double Value of the S-type spectral variable at the reference</span></div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno"> 588</span><span class="comment">* point, i.e. the CRVALia keyvalue, SI units.</span></div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno"> 589</span><span class="comment">*</span></div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno"> 590</span><span class="comment">* cdeltS1 double Increment of the S-type spectral variable at the</span></div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno"> 591</span><span class="comment">* reference point, SI units.</span></div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno"> 592</span><span class="comment">*</span></div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno"> 593</span><span class="comment">* restfrq,</span></div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno"> 594</span><span class="comment">* restwav double Rest frequency [Hz] and rest wavelength in vacuo [m],</span></div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno"> 595</span><span class="comment">* only one of which need be given, the other should be</span></div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno"> 596</span><span class="comment">* set to zero. Neither are required if the translation</span></div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno"> 597</span><span class="comment">* is between wave-characteristic types, or between</span></div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno"> 598</span><span class="comment">* velocity-characteristic types. E.g., required for</span></div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno"> 599</span><span class="comment">* 'FREQ' -> 'ZOPT-F2W', but not required for</span></div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno"> 600</span><span class="comment">* 'VELO-F2V' -> 'ZOPT-F2W'.</span></div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno"> 601</span><span class="comment">*</span></div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno"> 602</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno"> 603</span><span class="comment">* ctypeS2 char[9] Required spectral axis type (eight characters with</span></div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno"> 604</span><span class="comment">* null termination). The first four characters are</span></div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno"> 605</span><span class="comment">* required to be given and are never modified. The</span></div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno"> 606</span><span class="comment">* remaining four, the algorithm code, are completely</span></div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno"> 607</span><span class="comment">* determined by, and must be consistent with, ctypeS1</span></div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno"> 608</span><span class="comment">* and the first four characters of ctypeS2. A non-zero</span></div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno"> 609</span><span class="comment">* status value will be returned if they are inconsistent</span></div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno"> 610</span><span class="comment">* (see below). However, if the final three characters</span></div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno"> 611</span><span class="comment">* are specified as "???", or if just the eighth</span></div>
<div class="line"><a id="l00612" name="l00612"></a><span class="lineno"> 612</span><span class="comment">* character is specified as '?', the correct algorithm</span></div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno"> 613</span><span class="comment">* code will be substituted (applies for grism axes as</span></div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno"> 614</span><span class="comment">* well as non-grism).</span></div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno"> 615</span><span class="comment">*</span></div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno"> 616</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno"> 617</span><span class="comment">* crvalS2 double* Value of the new S-type spectral variable at the</span></div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno"> 618</span><span class="comment">* reference point, i.e. the new CRVALia keyvalue, SI</span></div>
<div class="line"><a id="l00619" name="l00619"></a><span class="lineno"> 619</span><span class="comment">* units.</span></div>
<div class="line"><a id="l00620" name="l00620"></a><span class="lineno"> 620</span><span class="comment">*</span></div>
<div class="line"><a id="l00621" name="l00621"></a><span class="lineno"> 621</span><span class="comment">* cdeltS2 double* Increment of the new S-type spectral variable at the</span></div>
<div class="line"><a id="l00622" name="l00622"></a><span class="lineno"> 622</span><span class="comment">* reference point, i.e. the new CDELTia keyvalue, SI</span></div>
<div class="line"><a id="l00623" name="l00623"></a><span class="lineno"> 623</span><span class="comment">* units.</span></div>
<div class="line"><a id="l00624" name="l00624"></a><span class="lineno"> 624</span><span class="comment">*</span></div>
<div class="line"><a id="l00625" name="l00625"></a><span class="lineno"> 625</span><span class="comment">* err struct wcserr **</span></div>
<div class="line"><a id="l00626" name="l00626"></a><span class="lineno"> 626</span><span class="comment">* If enabled, for function return values > 1, this</span></div>
<div class="line"><a id="l00627" name="l00627"></a><span class="lineno"> 627</span><span class="comment">* struct will contain a detailed error message, see</span></div>
<div class="line"><a id="l00628" name="l00628"></a><span class="lineno"> 628</span><span class="comment">* wcserr_enable(). May be NULL if an error message is</span></div>
<div class="line"><a id="l00629" name="l00629"></a><span class="lineno"> 629</span><span class="comment">* not desired. Otherwise, the user is responsible for</span></div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno"> 630</span><span class="comment">* deleting the memory allocated for the wcserr struct.</span></div>
<div class="line"><a id="l00631" name="l00631"></a><span class="lineno"> 631</span><span class="comment">*</span></div>
<div class="line"><a id="l00632" name="l00632"></a><span class="lineno"> 632</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno"> 633</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno"> 634</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno"> 635</span><span class="comment">* 2: Invalid spectral parameters.</span></div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno"> 636</span><span class="comment">*</span></div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno"> 637</span><span class="comment">* A status value of 2 will be returned if restfrq or</span></div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno"> 638</span><span class="comment">* restwav are not specified when required, or if ctypeS1</span></div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno"> 639</span><span class="comment">* or ctypeS2 are self-inconsistent, or have different</span></div>
<div class="line"><a id="l00640" name="l00640"></a><span class="lineno"> 640</span><span class="comment">* spectral X-type variables.</span></div>
<div class="line"><a id="l00641" name="l00641"></a><span class="lineno"> 641</span><span class="comment">*</span></div>
<div class="line"><a id="l00642" name="l00642"></a><span class="lineno"> 642</span><span class="comment">*</span></div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno"> 643</span><span class="comment">* spcaips() - Translate AIPS-convention spectral keywords</span></div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno"> 644</span><span class="comment">* -------------------------------------------------------</span></div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno"> 645</span><span class="comment">* spcaips() translates AIPS-convention spectral CTYPEia and VELREF keyvalues.</span></div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno"> 646</span><span class="comment">*</span></div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno"> 647</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno"> 648</span><span class="comment">* ctypeA const char[9]</span></div>
<div class="line"><a id="l00649" name="l00649"></a><span class="lineno"> 649</span><span class="comment">* CTYPEia keyvalue possibly containing an</span></div>
<div class="line"><a id="l00650" name="l00650"></a><span class="lineno"> 650</span><span class="comment">* AIPS-convention spectral code (eight characters, need</span></div>
<div class="line"><a id="l00651" name="l00651"></a><span class="lineno"> 651</span><span class="comment">* not be null-terminated).</span></div>
<div class="line"><a id="l00652" name="l00652"></a><span class="lineno"> 652</span><span class="comment">*</span></div>
<div class="line"><a id="l00653" name="l00653"></a><span class="lineno"> 653</span><span class="comment">* velref int AIPS-convention VELREF code. It has the following</span></div>
<div class="line"><a id="l00654" name="l00654"></a><span class="lineno"> 654</span><span class="comment">* integer values:</span></div>
<div class="line"><a id="l00655" name="l00655"></a><span class="lineno"> 655</span><span class="comment">* 1: LSR kinematic, originally described simply as</span></div>
<div class="line"><a id="l00656" name="l00656"></a><span class="lineno"> 656</span><span class="comment">* "LSR" without distinction between the kinematic</span></div>
<div class="line"><a id="l00657" name="l00657"></a><span class="lineno"> 657</span><span class="comment">* and dynamic definitions.</span></div>
<div class="line"><a id="l00658" name="l00658"></a><span class="lineno"> 658</span><span class="comment">* 2: Barycentric, originally described as "HEL"</span></div>
<div class="line"><a id="l00659" name="l00659"></a><span class="lineno"> 659</span><span class="comment">* meaning heliocentric.</span></div>
<div class="line"><a id="l00660" name="l00660"></a><span class="lineno"> 660</span><span class="comment">* 3: Topocentric, originally described as "OBS"</span></div>
<div class="line"><a id="l00661" name="l00661"></a><span class="lineno"> 661</span><span class="comment">* meaning geocentric but widely interpreted as</span></div>
<div class="line"><a id="l00662" name="l00662"></a><span class="lineno"> 662</span><span class="comment">* topocentric.</span></div>
<div class="line"><a id="l00663" name="l00663"></a><span class="lineno"> 663</span><span class="comment">* AIPS++ extensions to VELREF are also recognized:</span></div>
<div class="line"><a id="l00664" name="l00664"></a><span class="lineno"> 664</span><span class="comment">* 4: LSR dynamic.</span></div>
<div class="line"><a id="l00665" name="l00665"></a><span class="lineno"> 665</span><span class="comment">* 5: Geocentric.</span></div>
<div class="line"><a id="l00666" name="l00666"></a><span class="lineno"> 666</span><span class="comment">* 6: Source rest frame.</span></div>
<div class="line"><a id="l00667" name="l00667"></a><span class="lineno"> 667</span><span class="comment">* 7: Galactocentric.</span></div>
<div class="line"><a id="l00668" name="l00668"></a><span class="lineno"> 668</span><span class="comment">*</span></div>
<div class="line"><a id="l00669" name="l00669"></a><span class="lineno"> 669</span><span class="comment">* For an AIPS 'VELO' axis, a radio convention velocity</span></div>
<div class="line"><a id="l00670" name="l00670"></a><span class="lineno"> 670</span><span class="comment">* (VRAD) is denoted by adding 256 to VELREF, otherwise</span></div>
<div class="line"><a id="l00671" name="l00671"></a><span class="lineno"> 671</span><span class="comment">* an optical velocity (VOPT) is indicated (this is not</span></div>
<div class="line"><a id="l00672" name="l00672"></a><span class="lineno"> 672</span><span class="comment">* applicable to 'FREQ' or 'FELO' axes). Setting velref</span></div>
<div class="line"><a id="l00673" name="l00673"></a><span class="lineno"> 673</span><span class="comment">* to 0 or 256 chooses between optical and radio velocity</span></div>
<div class="line"><a id="l00674" name="l00674"></a><span class="lineno"> 674</span><span class="comment">* without specifying a Doppler frame, provided that a</span></div>
<div class="line"><a id="l00675" name="l00675"></a><span class="lineno"> 675</span><span class="comment">* frame is encoded in ctypeA. If not, i.e. for</span></div>
<div class="line"><a id="l00676" name="l00676"></a><span class="lineno"> 676</span><span class="comment">* ctypeA = 'VELO', ctype will be returned as 'VELO'.</span></div>
<div class="line"><a id="l00677" name="l00677"></a><span class="lineno"> 677</span><span class="comment">*</span></div>
<div class="line"><a id="l00678" name="l00678"></a><span class="lineno"> 678</span><span class="comment">* VELREF takes precedence over CTYPEia in defining the</span></div>
<div class="line"><a id="l00679" name="l00679"></a><span class="lineno"> 679</span><span class="comment">* Doppler frame, e.g.</span></div>
<div class="line"><a id="l00680" name="l00680"></a><span class="lineno"> 680</span><span class="comment">*</span></div>
<div class="line"><a id="l00681" name="l00681"></a><span class="lineno"> 681</span><span class="comment">= ctypeA = 'VELO-HEL'</span></div>
<div class="line"><a id="l00682" name="l00682"></a><span class="lineno"> 682</span><span class="comment">= velref = 1</span></div>
<div class="line"><a id="l00683" name="l00683"></a><span class="lineno"> 683</span><span class="comment">*</span></div>
<div class="line"><a id="l00684" name="l00684"></a><span class="lineno"> 684</span><span class="comment">* returns ctype = 'VOPT' with specsys set to 'LSRK'.</span></div>
<div class="line"><a id="l00685" name="l00685"></a><span class="lineno"> 685</span><span class="comment">*</span></div>
<div class="line"><a id="l00686" name="l00686"></a><span class="lineno"> 686</span><span class="comment">* If omitted from the header, the default value of</span></div>
<div class="line"><a id="l00687" name="l00687"></a><span class="lineno"> 687</span><span class="comment">* VELREF is 0.</span></div>
<div class="line"><a id="l00688" name="l00688"></a><span class="lineno"> 688</span><span class="comment">*</span></div>
<div class="line"><a id="l00689" name="l00689"></a><span class="lineno"> 689</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00690" name="l00690"></a><span class="lineno"> 690</span><span class="comment">* ctype char[9] Translated CTYPEia keyvalue, or a copy of ctypeA if no</span></div>
<div class="line"><a id="l00691" name="l00691"></a><span class="lineno"> 691</span><span class="comment">* translation was performed (in which case any trailing</span></div>
<div class="line"><a id="l00692" name="l00692"></a><span class="lineno"> 692</span><span class="comment">* blanks in ctypeA will be replaced with nulls).</span></div>
<div class="line"><a id="l00693" name="l00693"></a><span class="lineno"> 693</span><span class="comment">*</span></div>
<div class="line"><a id="l00694" name="l00694"></a><span class="lineno"> 694</span><span class="comment">* specsys char[9] Doppler reference frame indicated by VELREF or else</span></div>
<div class="line"><a id="l00695" name="l00695"></a><span class="lineno"> 695</span><span class="comment">* by CTYPEia with value corresponding to the SPECSYS</span></div>
<div class="line"><a id="l00696" name="l00696"></a><span class="lineno"> 696</span><span class="comment">* keyvalue in the FITS WCS standard. May be returned</span></div>
<div class="line"><a id="l00697" name="l00697"></a><span class="lineno"> 697</span><span class="comment">* blank if neither specifies a Doppler frame, e.g.</span></div>
<div class="line"><a id="l00698" name="l00698"></a><span class="lineno"> 698</span><span class="comment">* ctypeA = 'FELO' and velref%256 == 0.</span></div>
<div class="line"><a id="l00699" name="l00699"></a><span class="lineno"> 699</span><span class="comment">*</span></div>
<div class="line"><a id="l00700" name="l00700"></a><span class="lineno"> 700</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00701" name="l00701"></a><span class="lineno"> 701</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00702" name="l00702"></a><span class="lineno"> 702</span><span class="comment">* -1: No translation required (not an error).</span></div>
<div class="line"><a id="l00703" name="l00703"></a><span class="lineno"> 703</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00704" name="l00704"></a><span class="lineno"> 704</span><span class="comment">* 2: Invalid value of VELREF.</span></div>
<div class="line"><a id="l00705" name="l00705"></a><span class="lineno"> 705</span><span class="comment">*</span></div>
<div class="line"><a id="l00706" name="l00706"></a><span class="lineno"> 706</span><span class="comment">*</span></div>
<div class="line"><a id="l00707" name="l00707"></a><span class="lineno"> 707</span><span class="comment">* spcprm struct - Spectral transformation parameters</span></div>
<div class="line"><a id="l00708" name="l00708"></a><span class="lineno"> 708</span><span class="comment">* --------------------------------------------------</span></div>
<div class="line"><a id="l00709" name="l00709"></a><span class="lineno"> 709</span><span class="comment">* The spcprm struct contains information required to transform spectral</span></div>
<div class="line"><a id="l00710" name="l00710"></a><span class="lineno"> 710</span><span class="comment">* coordinates. It consists of certain members that must be set by the user</span></div>
<div class="line"><a id="l00711" name="l00711"></a><span class="lineno"> 711</span><span class="comment">* ("given") and others that are set by the WCSLIB routines ("returned"). Some</span></div>
<div class="line"><a id="l00712" name="l00712"></a><span class="lineno"> 712</span><span class="comment">* of the latter are supplied for informational purposes while others are for</span></div>
<div class="line"><a id="l00713" name="l00713"></a><span class="lineno"> 713</span><span class="comment">* internal use only.</span></div>
<div class="line"><a id="l00714" name="l00714"></a><span class="lineno"> 714</span><span class="comment">*</span></div>
<div class="line"><a id="l00715" name="l00715"></a><span class="lineno"> 715</span><span class="comment">* int flag</span></div>
<div class="line"><a id="l00716" name="l00716"></a><span class="lineno"> 716</span><span class="comment">* (Given and returned) This flag must be set to zero whenever any of the</span></div>
<div class="line"><a id="l00717" name="l00717"></a><span class="lineno"> 717</span><span class="comment">* following spcprm structure members are set or changed:</span></div>
<div class="line"><a id="l00718" name="l00718"></a><span class="lineno"> 718</span><span class="comment">*</span></div>
<div class="line"><a id="l00719" name="l00719"></a><span class="lineno"> 719</span><span class="comment">* - spcprm::type,</span></div>
<div class="line"><a id="l00720" name="l00720"></a><span class="lineno"> 720</span><span class="comment">* - spcprm::code,</span></div>
<div class="line"><a id="l00721" name="l00721"></a><span class="lineno"> 721</span><span class="comment">* - spcprm::crval,</span></div>
<div class="line"><a id="l00722" name="l00722"></a><span class="lineno"> 722</span><span class="comment">* - spcprm::restfrq,</span></div>
<div class="line"><a id="l00723" name="l00723"></a><span class="lineno"> 723</span><span class="comment">* - spcprm::restwav,</span></div>
<div class="line"><a id="l00724" name="l00724"></a><span class="lineno"> 724</span><span class="comment">* - spcprm::pv[].</span></div>
<div class="line"><a id="l00725" name="l00725"></a><span class="lineno"> 725</span><span class="comment">*</span></div>
<div class="line"><a id="l00726" name="l00726"></a><span class="lineno"> 726</span><span class="comment">* This signals the initialization routine, spcset(), to recompute the</span></div>
<div class="line"><a id="l00727" name="l00727"></a><span class="lineno"> 727</span><span class="comment">* returned members of the spcprm struct. spcset() will reset flag to</span></div>
<div class="line"><a id="l00728" name="l00728"></a><span class="lineno"> 728</span><span class="comment">* indicate that this has been done.</span></div>
<div class="line"><a id="l00729" name="l00729"></a><span class="lineno"> 729</span><span class="comment">*</span></div>
<div class="line"><a id="l00730" name="l00730"></a><span class="lineno"> 730</span><span class="comment">* char type[8]</span></div>
<div class="line"><a id="l00731" name="l00731"></a><span class="lineno"> 731</span><span class="comment">* (Given) Four-letter spectral variable type, e.g "ZOPT" for</span></div>
<div class="line"><a id="l00732" name="l00732"></a><span class="lineno"> 732</span><span class="comment">* CTYPEia = 'ZOPT-F2W'. (Declared as char[8] for alignment reasons.)</span></div>
<div class="line"><a id="l00733" name="l00733"></a><span class="lineno"> 733</span><span class="comment">*</span></div>
<div class="line"><a id="l00734" name="l00734"></a><span class="lineno"> 734</span><span class="comment">* char code[4]</span></div>
<div class="line"><a id="l00735" name="l00735"></a><span class="lineno"> 735</span><span class="comment">* (Given) Three-letter spectral algorithm code, e.g "F2W" for</span></div>
<div class="line"><a id="l00736" name="l00736"></a><span class="lineno"> 736</span><span class="comment">* CTYPEia = 'ZOPT-F2W'.</span></div>
<div class="line"><a id="l00737" name="l00737"></a><span class="lineno"> 737</span><span class="comment">*</span></div>
<div class="line"><a id="l00738" name="l00738"></a><span class="lineno"> 738</span><span class="comment">* double crval</span></div>
<div class="line"><a id="l00739" name="l00739"></a><span class="lineno"> 739</span><span class="comment">* (Given) Reference value (CRVALia), SI units.</span></div>
<div class="line"><a id="l00740" name="l00740"></a><span class="lineno"> 740</span><span class="comment">*</span></div>
<div class="line"><a id="l00741" name="l00741"></a><span class="lineno"> 741</span><span class="comment">* double restfrq</span></div>
<div class="line"><a id="l00742" name="l00742"></a><span class="lineno"> 742</span><span class="comment">* (Given) The rest frequency [Hz], and ...</span></div>
<div class="line"><a id="l00743" name="l00743"></a><span class="lineno"> 743</span><span class="comment">*</span></div>
<div class="line"><a id="l00744" name="l00744"></a><span class="lineno"> 744</span><span class="comment">* double restwav</span></div>
<div class="line"><a id="l00745" name="l00745"></a><span class="lineno"> 745</span><span class="comment">* (Given) ... the rest wavelength in vacuo [m], only one of which need be</span></div>
<div class="line"><a id="l00746" name="l00746"></a><span class="lineno"> 746</span><span class="comment">* given, the other should be set to zero. Neither are required if the</span></div>
<div class="line"><a id="l00747" name="l00747"></a><span class="lineno"> 747</span><span class="comment">* X and S spectral variables are both wave-characteristic, or both</span></div>
<div class="line"><a id="l00748" name="l00748"></a><span class="lineno"> 748</span><span class="comment">* velocity-characteristic, types.</span></div>
<div class="line"><a id="l00749" name="l00749"></a><span class="lineno"> 749</span><span class="comment">*</span></div>
<div class="line"><a id="l00750" name="l00750"></a><span class="lineno"> 750</span><span class="comment">* double pv[7]</span></div>
<div class="line"><a id="l00751" name="l00751"></a><span class="lineno"> 751</span><span class="comment">* (Given) Grism parameters for 'GRI' and 'GRA' algorithm codes:</span></div>
<div class="line"><a id="l00752" name="l00752"></a><span class="lineno"> 752</span><span class="comment">* - 0: G, grating ruling density.</span></div>
<div class="line"><a id="l00753" name="l00753"></a><span class="lineno"> 753</span><span class="comment">* - 1: m, interference order.</span></div>
<div class="line"><a id="l00754" name="l00754"></a><span class="lineno"> 754</span><span class="comment">* - 2: alpha, angle of incidence [deg].</span></div>
<div class="line"><a id="l00755" name="l00755"></a><span class="lineno"> 755</span><span class="comment">* - 3: n_r, refractive index at the reference wavelength, lambda_r.</span></div>
<div class="line"><a id="l00756" name="l00756"></a><span class="lineno"> 756</span><span class="comment">* - 4: n'_r, dn/dlambda at the reference wavelength, lambda_r (/m).</span></div>
<div class="line"><a id="l00757" name="l00757"></a><span class="lineno"> 757</span><span class="comment">* - 5: epsilon, grating tilt angle [deg].</span></div>
<div class="line"><a id="l00758" name="l00758"></a><span class="lineno"> 758</span><span class="comment">* - 6: theta, detector tilt angle [deg].</span></div>
<div class="line"><a id="l00759" name="l00759"></a><span class="lineno"> 759</span><span class="comment">*</span></div>
<div class="line"><a id="l00760" name="l00760"></a><span class="lineno"> 760</span><span class="comment">* The remaining members of the spcprm struct are maintained by spcset() and</span></div>
<div class="line"><a id="l00761" name="l00761"></a><span class="lineno"> 761</span><span class="comment">* must not be modified elsewhere:</span></div>
<div class="line"><a id="l00762" name="l00762"></a><span class="lineno"> 762</span><span class="comment">*</span></div>
<div class="line"><a id="l00763" name="l00763"></a><span class="lineno"> 763</span><span class="comment">* double w[6]</span></div>
<div class="line"><a id="l00764" name="l00764"></a><span class="lineno"> 764</span><span class="comment">* (Returned) Intermediate values:</span></div>
<div class="line"><a id="l00765" name="l00765"></a><span class="lineno"> 765</span><span class="comment">* - 0: Rest frequency or wavelength (SI).</span></div>
<div class="line"><a id="l00766" name="l00766"></a><span class="lineno"> 766</span><span class="comment">* - 1: The value of the X-type spectral variable at the reference point</span></div>
<div class="line"><a id="l00767" name="l00767"></a><span class="lineno"> 767</span><span class="comment">* (SI units).</span></div>
<div class="line"><a id="l00768" name="l00768"></a><span class="lineno"> 768</span><span class="comment">* - 2: dX/dS at the reference point (SI units).</span></div>
<div class="line"><a id="l00769" name="l00769"></a><span class="lineno"> 769</span><span class="comment">* The remainder are grism intermediates.</span></div>
<div class="line"><a id="l00770" name="l00770"></a><span class="lineno"> 770</span><span class="comment">*</span></div>
<div class="line"><a id="l00771" name="l00771"></a><span class="lineno"> 771</span><span class="comment">* int isGrism</span></div>
<div class="line"><a id="l00772" name="l00772"></a><span class="lineno"> 772</span><span class="comment">* (Returned) Grism coordinates?</span></div>
<div class="line"><a id="l00773" name="l00773"></a><span class="lineno"> 773</span><span class="comment">* - 0: no,</span></div>
<div class="line"><a id="l00774" name="l00774"></a><span class="lineno"> 774</span><span class="comment">* - 1: in vacuum,</span></div>
<div class="line"><a id="l00775" name="l00775"></a><span class="lineno"> 775</span><span class="comment">* - 2: in air.</span></div>
<div class="line"><a id="l00776" name="l00776"></a><span class="lineno"> 776</span><span class="comment">*</span></div>
<div class="line"><a id="l00777" name="l00777"></a><span class="lineno"> 777</span><span class="comment">* int padding1</span></div>
<div class="line"><a id="l00778" name="l00778"></a><span class="lineno"> 778</span><span class="comment">* (An unused variable inserted for alignment purposes only.)</span></div>
<div class="line"><a id="l00779" name="l00779"></a><span class="lineno"> 779</span><span class="comment">*</span></div>
<div class="line"><a id="l00780" name="l00780"></a><span class="lineno"> 780</span><span class="comment">* struct wcserr *err</span></div>
<div class="line"><a id="l00781" name="l00781"></a><span class="lineno"> 781</span><span class="comment">* (Returned) If enabled, when an error status is returned, this struct</span></div>
<div class="line"><a id="l00782" name="l00782"></a><span class="lineno"> 782</span><span class="comment">* contains detailed information about the error, see wcserr_enable().</span></div>
<div class="line"><a id="l00783" name="l00783"></a><span class="lineno"> 783</span><span class="comment">*</span></div>
<div class="line"><a id="l00784" name="l00784"></a><span class="lineno"> 784</span><span class="comment">* void *padding2</span></div>
<div class="line"><a id="l00785" name="l00785"></a><span class="lineno"> 785</span><span class="comment">* (An unused variable inserted for alignment purposes only.)</span></div>
<div class="line"><a id="l00786" name="l00786"></a><span class="lineno"> 786</span><span class="comment">* int (*spxX2P)(SPX_ARGS)</span></div>
<div class="line"><a id="l00787" name="l00787"></a><span class="lineno"> 787</span><span class="comment">* (Returned) The first and ...</span></div>
<div class="line"><a id="l00788" name="l00788"></a><span class="lineno"> 788</span><span class="comment">* int (*spxP2S)(SPX_ARGS)</span></div>
<div class="line"><a id="l00789" name="l00789"></a><span class="lineno"> 789</span><span class="comment">* (Returned) ... the second of the pointers to the transformation</span></div>
<div class="line"><a id="l00790" name="l00790"></a><span class="lineno"> 790</span><span class="comment">* functions in the two-step algorithm chain X -> P -> S in the</span></div>
<div class="line"><a id="l00791" name="l00791"></a><span class="lineno"> 791</span><span class="comment">* pixel-to-spectral direction where the non-linear transformation is from</span></div>
<div class="line"><a id="l00792" name="l00792"></a><span class="lineno"> 792</span><span class="comment">* X to P. The argument list, SPX_ARGS, is defined in spx.h.</span></div>
<div class="line"><a id="l00793" name="l00793"></a><span class="lineno"> 793</span><span class="comment">*</span></div>
<div class="line"><a id="l00794" name="l00794"></a><span class="lineno"> 794</span><span class="comment">* int (*spxS2P)(SPX_ARGS)</span></div>
<div class="line"><a id="l00795" name="l00795"></a><span class="lineno"> 795</span><span class="comment">* (Returned) The first and ...</span></div>
<div class="line"><a id="l00796" name="l00796"></a><span class="lineno"> 796</span><span class="comment">* int (*spxP2X)(SPX_ARGS)</span></div>
<div class="line"><a id="l00797" name="l00797"></a><span class="lineno"> 797</span><span class="comment">* (Returned) ... the second of the pointers to the transformation</span></div>
<div class="line"><a id="l00798" name="l00798"></a><span class="lineno"> 798</span><span class="comment">* functions in the two-step algorithm chain S -> P -> X in the</span></div>
<div class="line"><a id="l00799" name="l00799"></a><span class="lineno"> 799</span><span class="comment">* spectral-to-pixel direction where the non-linear transformation is from</span></div>
<div class="line"><a id="l00800" name="l00800"></a><span class="lineno"> 800</span><span class="comment">* P to X. The argument list, SPX_ARGS, is defined in spx.h.</span></div>
<div class="line"><a id="l00801" name="l00801"></a><span class="lineno"> 801</span><span class="comment">*</span></div>
<div class="line"><a id="l00802" name="l00802"></a><span class="lineno"> 802</span><span class="comment">*</span></div>
<div class="line"><a id="l00803" name="l00803"></a><span class="lineno"> 803</span><span class="comment">* Global variable: const char *spc_errmsg[] - Status return messages</span></div>
<div class="line"><a id="l00804" name="l00804"></a><span class="lineno"> 804</span><span class="comment">* ------------------------------------------------------------------</span></div>
<div class="line"><a id="l00805" name="l00805"></a><span class="lineno"> 805</span><span class="comment">* Error messages to match the status value returned from each function.</span></div>
<div class="line"><a id="l00806" name="l00806"></a><span class="lineno"> 806</span><span class="comment">*</span></div>
<div class="line"><a id="l00807" name="l00807"></a><span class="lineno"> 807</span><span class="comment">*===========================================================================*/</span></div>
<div class="line"><a id="l00808" name="l00808"></a><span class="lineno"> 808</span> </div>
<div class="line"><a id="l00809" name="l00809"></a><span class="lineno"> 809</span><span class="preprocessor">#ifndef WCSLIB_SPC</span></div>
<div class="line"><a id="l00810" name="l00810"></a><span class="lineno"> 810</span><span class="preprocessor">#define WCSLIB_SPC</span></div>
<div class="line"><a id="l00811" name="l00811"></a><span class="lineno"> 811</span> </div>
<div class="line"><a id="l00812" name="l00812"></a><span class="lineno"> 812</span><span class="preprocessor">#include "<a class="code" href="spx_8h.html">spx.h</a>"</span></div>
<div class="line"><a id="l00813" name="l00813"></a><span class="lineno"> 813</span> </div>
<div class="line"><a id="l00814" name="l00814"></a><span class="lineno"> 814</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l00815" name="l00815"></a><span class="lineno"> 815</span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
<div class="line"><a id="l00816" name="l00816"></a><span class="lineno"> 816</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00817" name="l00817"></a><span class="lineno"> 817</span> </div>
<div class="line"><a id="l00818" name="l00818"></a><span class="lineno"> 818</span> </div>
<div class="line"><a id="l00819" name="l00819"></a><span class="lineno"> 819</span><span class="keyword">extern</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code hl_variable" href="spc_8h.html#a96978fec523018fd6898301a3452c166">spc_errmsg</a>[];</div>
<div class="line"><a id="l00820" name="l00820"></a><span class="lineno"> 820</span> </div>
<div class="foldopen" id="foldopen00821" data-start="{" data-end="};">
<div class="line"><a id="l00821" name="l00821"></a><span class="lineno"><a class="line" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3b"> 821</a></span><span class="keyword">enum</span> <a class="code hl_enumeration" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3b">spc_errmsg_enum</a> {</div>
<div class="line"><a id="l00822" name="l00822"></a><span class="lineno"><a class="line" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3bae000828492cbedc0502f757d8b892606"> 822</a></span> <a class="code hl_enumvalue" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3bae000828492cbedc0502f757d8b892606">SPCERR_NO_CHANGE</a> = -1, <span class="comment">// No change.</span></div>
<div class="line"><a id="l00823" name="l00823"></a><span class="lineno"><a class="line" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba0b84f38d1e903eacda3122ce55bff741"> 823</a></span> <a class="code hl_enumvalue" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba0b84f38d1e903eacda3122ce55bff741">SPCERR_SUCCESS</a> = 0, <span class="comment">// Success.</span></div>
<div class="line"><a id="l00824" name="l00824"></a><span class="lineno"><a class="line" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba7c5e0d09fac9f441e39f3cf28801961f"> 824</a></span> <a class="code hl_enumvalue" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba7c5e0d09fac9f441e39f3cf28801961f">SPCERR_NULL_POINTER</a> = 1, <span class="comment">// Null spcprm pointer passed.</span></div>
<div class="line"><a id="l00825" name="l00825"></a><span class="lineno"><a class="line" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba0653e60411a641a326492c65d257daa8"> 825</a></span> <a class="code hl_enumvalue" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba0653e60411a641a326492c65d257daa8">SPCERR_BAD_SPEC_PARAMS</a> = 2, <span class="comment">// Invalid spectral parameters.</span></div>
<div class="line"><a id="l00826" name="l00826"></a><span class="lineno"><a class="line" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba3ba9183c7c3dace15eef0606980fd615"> 826</a></span> <a class="code hl_enumvalue" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba3ba9183c7c3dace15eef0606980fd615">SPCERR_BAD_X</a> = 3, <span class="comment">// One or more of x coordinates were</span></div>
<div class="line"><a id="l00827" name="l00827"></a><span class="lineno"> 827</span> <span class="comment">// invalid.</span></div>
<div class="line"><a id="l00828" name="l00828"></a><span class="lineno"> 828</span> <a class="code hl_enumvalue" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba7e218c5bd52bd6a45d8ad66573653007">SPCERR_BAD_SPEC</a> = 4 <span class="comment">// One or more of the spec coordinates were</span></div>
<div class="line"><a id="l00829" name="l00829"></a><span class="lineno"> 829</span> <span class="comment">// invalid.</span></div>
<div class="line"><a id="l00830" name="l00830"></a><span class="lineno"><a class="line" href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba7e218c5bd52bd6a45d8ad66573653007"> 830</a></span>};</div>
</div>
<div class="line"><a id="l00831" name="l00831"></a><span class="lineno"> 831</span> </div>
<div class="foldopen" id="foldopen00832" data-start="{" data-end="};">
<div class="line"><a id="l00832" name="l00832"></a><span class="lineno"><a class="line" href="structspcprm.html"> 832</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structspcprm.html">spcprm</a> {</div>
<div class="line"><a id="l00833" name="l00833"></a><span class="lineno"> 833</span> <span class="comment">// Initialization flag (see the prologue above).</span></div>
<div class="line"><a id="l00834" name="l00834"></a><span class="lineno"> 834</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00835" name="l00835"></a><span class="lineno"><a class="line" href="structspcprm.html#afeeb5f4056f271fd37291a712a7b6791"> 835</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structspcprm.html#afeeb5f4056f271fd37291a712a7b6791">flag</a>; <span class="comment">// Set to zero to force initialization.</span></div>
<div class="line"><a id="l00836" name="l00836"></a><span class="lineno"> 836</span> </div>
<div class="line"><a id="l00837" name="l00837"></a><span class="lineno"> 837</span> <span class="comment">// Parameters to be provided (see the prologue above).</span></div>
<div class="line"><a id="l00838" name="l00838"></a><span class="lineno"> 838</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00839" name="l00839"></a><span class="lineno"><a class="line" href="structspcprm.html#a387d74de3215763d7e22c222b19a2c44"> 839</a></span> <span class="keywordtype">char</span> <a class="code hl_variable" href="structspcprm.html#a387d74de3215763d7e22c222b19a2c44">type</a>[8]; <span class="comment">// Four-letter spectral variable type.</span></div>
<div class="line"><a id="l00840" name="l00840"></a><span class="lineno"><a class="line" href="structspcprm.html#a5f9a48a52144f8ced93baaffc107a3a6"> 840</a></span> <span class="keywordtype">char</span> <a class="code hl_variable" href="structspcprm.html#a5f9a48a52144f8ced93baaffc107a3a6">code</a>[4]; <span class="comment">// Three-letter spectral algorithm code.</span></div>
<div class="line"><a id="l00841" name="l00841"></a><span class="lineno"> 841</span> </div>
<div class="line"><a id="l00842" name="l00842"></a><span class="lineno"><a class="line" href="structspcprm.html#a2c5c2d97e6c5f617272834b1516c84de"> 842</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structspcprm.html#a2c5c2d97e6c5f617272834b1516c84de">crval</a>; <span class="comment">// Reference value (CRVALia), SI units.</span></div>
<div class="line"><a id="l00843" name="l00843"></a><span class="lineno"><a class="line" href="structspcprm.html#a74433ae0e7e1ec426777bafb402b50c4"> 843</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structspcprm.html#a74433ae0e7e1ec426777bafb402b50c4">restfrq</a>; <span class="comment">// Rest frequency, Hz.</span></div>
<div class="line"><a id="l00844" name="l00844"></a><span class="lineno"><a class="line" href="structspcprm.html#a4dbc8c7064ae790483017b6c81e7ded2"> 844</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structspcprm.html#a4dbc8c7064ae790483017b6c81e7ded2">restwav</a>; <span class="comment">// Rest wavelength, m.</span></div>
<div class="line"><a id="l00845" name="l00845"></a><span class="lineno"> 845</span> </div>
<div class="line"><a id="l00846" name="l00846"></a><span class="lineno"><a class="line" href="structspcprm.html#ae11db8d7ff8b605eed87298a32fd094d"> 846</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structspcprm.html#ae11db8d7ff8b605eed87298a32fd094d">pv</a>[7]; <span class="comment">// Grism parameters:</span></div>
<div class="line"><a id="l00847" name="l00847"></a><span class="lineno"> 847</span> <span class="comment">// 0: G, grating ruling density.</span></div>
<div class="line"><a id="l00848" name="l00848"></a><span class="lineno"> 848</span> <span class="comment">// 1: m, interference order.</span></div>
<div class="line"><a id="l00849" name="l00849"></a><span class="lineno"> 849</span> <span class="comment">// 2: alpha, angle of incidence.</span></div>
<div class="line"><a id="l00850" name="l00850"></a><span class="lineno"> 850</span> <span class="comment">// 3: n_r, refractive index at lambda_r.</span></div>
<div class="line"><a id="l00851" name="l00851"></a><span class="lineno"> 851</span> <span class="comment">// 4: n'_r, dn/dlambda at lambda_r.</span></div>
<div class="line"><a id="l00852" name="l00852"></a><span class="lineno"> 852</span> <span class="comment">// 5: epsilon, grating tilt angle.</span></div>
<div class="line"><a id="l00853" name="l00853"></a><span class="lineno"> 853</span> <span class="comment">// 6: theta, detector tilt angle.</span></div>
<div class="line"><a id="l00854" name="l00854"></a><span class="lineno"> 854</span> </div>
<div class="line"><a id="l00855" name="l00855"></a><span class="lineno"> 855</span> <span class="comment">// Information derived from the parameters supplied.</span></div>
<div class="line"><a id="l00856" name="l00856"></a><span class="lineno"> 856</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00857" name="l00857"></a><span class="lineno"><a class="line" href="structspcprm.html#a8ef0c963f1b0ee957f3403da7559a81c"> 857</a></span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structspcprm.html#a8ef0c963f1b0ee957f3403da7559a81c">w</a>[6]; <span class="comment">// Intermediate values.</span></div>
<div class="line"><a id="l00858" name="l00858"></a><span class="lineno"> 858</span> <span class="comment">// 0: Rest frequency or wavelength (SI).</span></div>
<div class="line"><a id="l00859" name="l00859"></a><span class="lineno"> 859</span> <span class="comment">// 1: CRVALX (SI units).</span></div>
<div class="line"><a id="l00860" name="l00860"></a><span class="lineno"> 860</span> <span class="comment">// 2: CDELTX/CDELTia = dX/dS (SI units).</span></div>
<div class="line"><a id="l00861" name="l00861"></a><span class="lineno"> 861</span> <span class="comment">// The remainder are grism intermediates.</span></div>
<div class="line"><a id="l00862" name="l00862"></a><span class="lineno"> 862</span> </div>
<div class="line"><a id="l00863" name="l00863"></a><span class="lineno"><a class="line" href="structspcprm.html#aec5d37c00d382a84a090d4f52d9a4346"> 863</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structspcprm.html#aec5d37c00d382a84a090d4f52d9a4346">isGrism</a>; <span class="comment">// Grism coordinates? 1: vacuum, 2: air.</span></div>
<div class="line"><a id="l00864" name="l00864"></a><span class="lineno"><a class="line" href="structspcprm.html#a844792d006c308f465ce8ca593a37df3"> 864</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structspcprm.html#a844792d006c308f465ce8ca593a37df3">padding1</a>; <span class="comment">// (Dummy inserted for alignment purposes.)</span></div>
<div class="line"><a id="l00865" name="l00865"></a><span class="lineno"> 865</span> </div>
<div class="line"><a id="l00866" name="l00866"></a><span class="lineno"> 866</span> <span class="comment">// Error handling</span></div>
<div class="line"><a id="l00867" name="l00867"></a><span class="lineno"> 867</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00868" name="l00868"></a><span class="lineno"><a class="line" href="structspcprm.html#a6d4124d4db8f7addcbfee99a8634522e"> 868</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structwcserr.html">wcserr</a> *<a class="code hl_variable" href="structspcprm.html#a6d4124d4db8f7addcbfee99a8634522e">err</a>;</div>
<div class="line"><a id="l00869" name="l00869"></a><span class="lineno"> 869</span> </div>
<div class="line"><a id="l00870" name="l00870"></a><span class="lineno"> 870</span> <span class="comment">// Private</span></div>
<div class="line"><a id="l00871" name="l00871"></a><span class="lineno"> 871</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00872" name="l00872"></a><span class="lineno"><a class="line" href="structspcprm.html#aa38c41f28ffff233bc7ffa0f3947b075"> 872</a></span> <span class="keywordtype">void</span> *<a class="code hl_variable" href="structspcprm.html#aa38c41f28ffff233bc7ffa0f3947b075">padding2</a>; <span class="comment">// (Dummy inserted for alignment purposes.)</span></div>
<div class="line"><a id="l00873" name="l00873"></a><span class="lineno"><a class="line" href="structspcprm.html#a20db4194170d78054908acf94b41d9d9"> 873</a></span> int (*<a class="code hl_variable" href="structspcprm.html#a20db4194170d78054908acf94b41d9d9">spxX2P</a>)(<a class="code hl_define" href="spx_8h.html#a777e5c4790da397aefcada61445a1bb3">SPX_ARGS</a>); <span class="comment">// Pointers to the transformation functions</span></div>
<div class="line"><a id="l00874" name="l00874"></a><span class="lineno"><a class="line" href="structspcprm.html#add01b70b4a074a7bdccff378ab61a948"> 874</a></span> int (*<a class="code hl_variable" href="structspcprm.html#add01b70b4a074a7bdccff378ab61a948">spxP2S</a>)(<a class="code hl_define" href="spx_8h.html#a777e5c4790da397aefcada61445a1bb3">SPX_ARGS</a>); <span class="comment">// in the two-step algorithm chain in the</span></div>
<div class="line"><a id="l00875" name="l00875"></a><span class="lineno"> 875</span> <span class="comment">// pixel-to-spectral direction.</span></div>
<div class="line"><a id="l00876" name="l00876"></a><span class="lineno"> 876</span> </div>
<div class="line"><a id="l00877" name="l00877"></a><span class="lineno"><a class="line" href="structspcprm.html#afb6a33994ad13f402efb68d20a97eee1"> 877</a></span> int (*<a class="code hl_variable" href="structspcprm.html#afb6a33994ad13f402efb68d20a97eee1">spxS2P</a>)(<a class="code hl_define" href="spx_8h.html#a777e5c4790da397aefcada61445a1bb3">SPX_ARGS</a>); <span class="comment">// Pointers to the transformation functions</span></div>
<div class="line"><a id="l00878" name="l00878"></a><span class="lineno"><a class="line" href="structspcprm.html#a6727d3a30592e54c7361e0434a795832"> 878</a></span> int (*<a class="code hl_variable" href="structspcprm.html#a6727d3a30592e54c7361e0434a795832">spxP2X</a>)(<a class="code hl_define" href="spx_8h.html#a777e5c4790da397aefcada61445a1bb3">SPX_ARGS</a>); <span class="comment">// in the two-step algorithm chain in the</span></div>
<div class="line"><a id="l00879" name="l00879"></a><span class="lineno"> 879</span> <span class="comment">// spectral-to-pixel direction.</span></div>
<div class="line"><a id="l00880" name="l00880"></a><span class="lineno"> 880</span>};</div>
</div>
<div class="line"><a id="l00881" name="l00881"></a><span class="lineno"> 881</span> </div>
<div class="line"><a id="l00882" name="l00882"></a><span class="lineno"> 882</span><span class="comment">// Size of the spcprm struct in int units, used by the Fortran wrappers.</span></div>
<div class="line"><a id="l00883" name="l00883"></a><span class="lineno"><a class="line" href="spc_8h.html#a4e195ae6c61da3608692a3c7f2395599"> 883</a></span><span class="preprocessor">#define SPCLEN (sizeof(struct spcprm)/sizeof(int))</span></div>
<div class="line"><a id="l00884" name="l00884"></a><span class="lineno"> 884</span> </div>
<div class="line"><a id="l00885" name="l00885"></a><span class="lineno"> 885</span> </div>
<div class="line"><a id="l00886" name="l00886"></a><span class="lineno"><a class="line" href="spc_8h.html#a30c95d776068ef3cc959a50af9995fa9"> 886</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#a30c95d776068ef3cc959a50af9995fa9">spcini</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structspcprm.html">spcprm</a> *spc);</div>
<div class="line"><a id="l00887" name="l00887"></a><span class="lineno"> 887</span> </div>
<div class="line"><a id="l00888" name="l00888"></a><span class="lineno"><a class="line" href="spc_8h.html#a2e04fc3ccd8aceebb4bfef56c5399a7d"> 888</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#a2e04fc3ccd8aceebb4bfef56c5399a7d">spcfree</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structspcprm.html">spcprm</a> *spc);</div>
<div class="line"><a id="l00889" name="l00889"></a><span class="lineno"> 889</span> </div>
<div class="line"><a id="l00890" name="l00890"></a><span class="lineno"><a class="line" href="spc_8h.html#a1c66412136507c5fb3992502a8a7a5b6"> 890</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#a1c66412136507c5fb3992502a8a7a5b6">spcsize</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structspcprm.html">spcprm</a> *spc, <span class="keywordtype">int</span> sizes[2]);</div>
<div class="line"><a id="l00891" name="l00891"></a><span class="lineno"> 891</span> </div>
<div class="line"><a id="l00892" name="l00892"></a><span class="lineno"><a class="line" href="spc_8h.html#a7304d0d00bcf9d2bad1f56ba6d8322ea"> 892</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#a7304d0d00bcf9d2bad1f56ba6d8322ea">spcprt</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structspcprm.html">spcprm</a> *spc);</div>
<div class="line"><a id="l00893" name="l00893"></a><span class="lineno"> 893</span> </div>
<div class="line"><a id="l00894" name="l00894"></a><span class="lineno"><a class="line" href="spc_8h.html#a42619bea16461baadc61524f39873f23"> 894</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#a42619bea16461baadc61524f39873f23">spcperr</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structspcprm.html">spcprm</a> *spc, <span class="keyword">const</span> <span class="keywordtype">char</span> *prefix);</div>
<div class="line"><a id="l00895" name="l00895"></a><span class="lineno"> 895</span> </div>
<div class="line"><a id="l00896" name="l00896"></a><span class="lineno"><a class="line" href="spc_8h.html#af2ee6399a65f2467841be79e4bbb41c3"> 896</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#af2ee6399a65f2467841be79e4bbb41c3">spcset</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structspcprm.html">spcprm</a> *spc);</div>
<div class="line"><a id="l00897" name="l00897"></a><span class="lineno"> 897</span> </div>
<div class="line"><a id="l00898" name="l00898"></a><span class="lineno"><a class="line" href="spc_8h.html#ae7fe86ae85a1a3bd19c2d78c3dba58f6"> 898</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#ae7fe86ae85a1a3bd19c2d78c3dba58f6">spcx2s</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structspcprm.html">spcprm</a> *spc, <span class="keywordtype">int</span> nx, <span class="keywordtype">int</span> sx, <span class="keywordtype">int</span> sspec,</div>
<div class="line"><a id="l00899" name="l00899"></a><span class="lineno"> 899</span> <span class="keyword">const</span> <span class="keywordtype">double</span> x[], <span class="keywordtype">double</span> spec[], <span class="keywordtype">int</span> stat[]);</div>
<div class="line"><a id="l00900" name="l00900"></a><span class="lineno"> 900</span> </div>
<div class="line"><a id="l00901" name="l00901"></a><span class="lineno"><a class="line" href="spc_8h.html#ae6e89217a5eca87a2101ae195da74347"> 901</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#ae6e89217a5eca87a2101ae195da74347">spcs2x</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structspcprm.html">spcprm</a> *spc, <span class="keywordtype">int</span> nspec, <span class="keywordtype">int</span> sspec, <span class="keywordtype">int</span> sx,</div>
<div class="line"><a id="l00902" name="l00902"></a><span class="lineno"> 902</span> <span class="keyword">const</span> <span class="keywordtype">double</span> spec[], <span class="keywordtype">double</span> x[], <span class="keywordtype">int</span> stat[]);</div>
<div class="line"><a id="l00903" name="l00903"></a><span class="lineno"> 903</span> </div>
<div class="line"><a id="l00904" name="l00904"></a><span class="lineno"><a class="line" href="spc_8h.html#aebcf04410f900ba05cb9bf1dcf3f28e8"> 904</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#aebcf04410f900ba05cb9bf1dcf3f28e8">spctype</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> ctype[9], <span class="keywordtype">char</span> stype[], <span class="keywordtype">char</span> scode[], <span class="keywordtype">char</span> sname[],</div>
<div class="line"><a id="l00905" name="l00905"></a><span class="lineno"> 905</span> <span class="keywordtype">char</span> units[], <span class="keywordtype">char</span> *ptype, <span class="keywordtype">char</span> *xtype, <span class="keywordtype">int</span> *restreq,</div>
<div class="line"><a id="l00906" name="l00906"></a><span class="lineno"> 906</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structwcserr.html">wcserr</a> **err);</div>
<div class="line"><a id="l00907" name="l00907"></a><span class="lineno"> 907</span> </div>
<div class="line"><a id="l00908" name="l00908"></a><span class="lineno"><a class="line" href="spc_8h.html#a006b5cc50a4559c348b544b3288d29c2"> 908</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#a006b5cc50a4559c348b544b3288d29c2">spcspxe</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> ctypeS[9], <span class="keywordtype">double</span> crvalS, <span class="keywordtype">double</span> restfrq,</div>
<div class="line"><a id="l00909" name="l00909"></a><span class="lineno"> 909</span> <span class="keywordtype">double</span> restwav, <span class="keywordtype">char</span> *ptype, <span class="keywordtype">char</span> *xtype, <span class="keywordtype">int</span> *restreq,</div>
<div class="line"><a id="l00910" name="l00910"></a><span class="lineno"> 910</span> <span class="keywordtype">double</span> *crvalX, <span class="keywordtype">double</span> *dXdS, <span class="keyword">struct</span> <a class="code hl_struct" href="structwcserr.html">wcserr</a> **err);</div>
<div class="line"><a id="l00911" name="l00911"></a><span class="lineno"> 911</span> </div>
<div class="line"><a id="l00912" name="l00912"></a><span class="lineno"><a class="line" href="spc_8h.html#afeb4b475bc9b32a7e1047595a3ab67a1"> 912</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#afeb4b475bc9b32a7e1047595a3ab67a1">spcxpse</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> ctypeS[9], <span class="keywordtype">double</span> crvalX, <span class="keywordtype">double</span> restfrq,</div>
<div class="line"><a id="l00913" name="l00913"></a><span class="lineno"> 913</span> <span class="keywordtype">double</span> restwav, <span class="keywordtype">char</span> *ptype, <span class="keywordtype">char</span> *xtype, <span class="keywordtype">int</span> *restreq,</div>
<div class="line"><a id="l00914" name="l00914"></a><span class="lineno"> 914</span> <span class="keywordtype">double</span> *crvalS, <span class="keywordtype">double</span> *dSdX, <span class="keyword">struct</span> <a class="code hl_struct" href="structwcserr.html">wcserr</a> **err);</div>
<div class="line"><a id="l00915" name="l00915"></a><span class="lineno"> 915</span> </div>
<div class="line"><a id="l00916" name="l00916"></a><span class="lineno"><a class="line" href="spc_8h.html#a5a48828b6fef06053957a51406d31bae"> 916</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#a5a48828b6fef06053957a51406d31bae">spctrne</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> ctypeS1[9], <span class="keywordtype">double</span> crvalS1, <span class="keywordtype">double</span> cdeltS1,</div>
<div class="line"><a id="l00917" name="l00917"></a><span class="lineno"> 917</span> <span class="keywordtype">double</span> restfrq, <span class="keywordtype">double</span> restwav, <span class="keywordtype">char</span> ctypeS2[9], <span class="keywordtype">double</span> *crvalS2,</div>
<div class="line"><a id="l00918" name="l00918"></a><span class="lineno"> 918</span> <span class="keywordtype">double</span> *cdeltS2, <span class="keyword">struct</span> <a class="code hl_struct" href="structwcserr.html">wcserr</a> **err);</div>
<div class="line"><a id="l00919" name="l00919"></a><span class="lineno"> 919</span> </div>
<div class="line"><a id="l00920" name="l00920"></a><span class="lineno"><a class="line" href="spc_8h.html#ac9dc37c9fdf2db04e23e26b7a51c8e6a"> 920</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#ac9dc37c9fdf2db04e23e26b7a51c8e6a">spcaips</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> ctypeA[9], <span class="keywordtype">int</span> velref, <span class="keywordtype">char</span> ctype[9], <span class="keywordtype">char</span> specsys[9]);</div>
<div class="line"><a id="l00921" name="l00921"></a><span class="lineno"> 921</span> </div>
<div class="line"><a id="l00922" name="l00922"></a><span class="lineno"> 922</span> </div>
<div class="line"><a id="l00923" name="l00923"></a><span class="lineno"> 923</span><span class="comment">// Deprecated.</span></div>
<div class="line"><a id="l00924" name="l00924"></a><span class="lineno"><a class="line" href="spc_8h.html#a4d66edc63bfc8a39adc6bac9e88c8e81"> 924</a></span><span class="preprocessor">#define spcini_errmsg spc_errmsg</span></div>
<div class="line"><a id="l00925" name="l00925"></a><span class="lineno"><a class="line" href="spc_8h.html#ac39694faccdd56850677999d714cd14a"> 925</a></span><span class="preprocessor">#define spcprt_errmsg spc_errmsg</span></div>
<div class="line"><a id="l00926" name="l00926"></a><span class="lineno"><a class="line" href="spc_8h.html#a49807752ce4e223d4095cf6ad13bac0a"> 926</a></span><span class="preprocessor">#define spcset_errmsg spc_errmsg</span></div>
<div class="line"><a id="l00927" name="l00927"></a><span class="lineno"><a class="line" href="spc_8h.html#aab517aed3ee9f8d5a5ca1f990d310b61"> 927</a></span><span class="preprocessor">#define spcx2s_errmsg spc_errmsg</span></div>
<div class="line"><a id="l00928" name="l00928"></a><span class="lineno"><a class="line" href="spc_8h.html#af0e4274b242fd41625b6ad4f4376b8da"> 928</a></span><span class="preprocessor">#define spcs2x_errmsg spc_errmsg</span></div>
<div class="line"><a id="l00929" name="l00929"></a><span class="lineno"> 929</span> </div>
<div class="line"><a id="l00930" name="l00930"></a><span class="lineno"><a class="line" href="spc_8h.html#aafe9e11caad5ac050e5479041c250a32"> 930</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#aafe9e11caad5ac050e5479041c250a32">spctyp</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> ctype[9], <span class="keywordtype">char</span> stype[], <span class="keywordtype">char</span> scode[], <span class="keywordtype">char</span> sname[],</div>
<div class="line"><a id="l00931" name="l00931"></a><span class="lineno"> 931</span> <span class="keywordtype">char</span> units[], <span class="keywordtype">char</span> *ptype, <span class="keywordtype">char</span> *xtype, <span class="keywordtype">int</span> *restreq);</div>
<div class="line"><a id="l00932" name="l00932"></a><span class="lineno"><a class="line" href="spc_8h.html#a6bbde2603e62b96e09576e77ed3446c7"> 932</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#a6bbde2603e62b96e09576e77ed3446c7">spcspx</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> ctypeS[9], <span class="keywordtype">double</span> crvalS, <span class="keywordtype">double</span> restfrq,</div>
<div class="line"><a id="l00933" name="l00933"></a><span class="lineno"> 933</span> <span class="keywordtype">double</span> restwav, <span class="keywordtype">char</span> *ptype, <span class="keywordtype">char</span> *xtype, <span class="keywordtype">int</span> *restreq,</div>
<div class="line"><a id="l00934" name="l00934"></a><span class="lineno"> 934</span> <span class="keywordtype">double</span> *crvalX, <span class="keywordtype">double</span> *dXdS);</div>
<div class="line"><a id="l00935" name="l00935"></a><span class="lineno"><a class="line" href="spc_8h.html#aa1a03a96e0417b3f5481eb3730386658"> 935</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#aa1a03a96e0417b3f5481eb3730386658">spcxps</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> ctypeS[9], <span class="keywordtype">double</span> crvalX, <span class="keywordtype">double</span> restfrq,</div>
<div class="line"><a id="l00936" name="l00936"></a><span class="lineno"> 936</span> <span class="keywordtype">double</span> restwav, <span class="keywordtype">char</span> *ptype, <span class="keywordtype">char</span> *xtype, <span class="keywordtype">int</span> *restreq,</div>
<div class="line"><a id="l00937" name="l00937"></a><span class="lineno"> 937</span> <span class="keywordtype">double</span> *crvalS, <span class="keywordtype">double</span> *dSdX);</div>
<div class="line"><a id="l00938" name="l00938"></a><span class="lineno"><a class="line" href="spc_8h.html#a467e30a1edcf29d6a096f29f8710395b"> 938</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="spc_8h.html#a467e30a1edcf29d6a096f29f8710395b">spctrn</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> ctypeS1[9], <span class="keywordtype">double</span> crvalS1, <span class="keywordtype">double</span> cdeltS1,</div>
<div class="line"><a id="l00939" name="l00939"></a><span class="lineno"> 939</span> <span class="keywordtype">double</span> restfrq, <span class="keywordtype">double</span> restwav, <span class="keywordtype">char</span> ctypeS2[9], <span class="keywordtype">double</span> *crvalS2,</div>
<div class="line"><a id="l00940" name="l00940"></a><span class="lineno"> 940</span> <span class="keywordtype">double</span> *cdeltS2);</div>
<div class="line"><a id="l00941" name="l00941"></a><span class="lineno"> 941</span> </div>
<div class="line"><a id="l00942" name="l00942"></a><span class="lineno"> 942</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l00943" name="l00943"></a><span class="lineno"> 943</span>}</div>
<div class="line"><a id="l00944" name="l00944"></a><span class="lineno"> 944</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00945" name="l00945"></a><span class="lineno"> 945</span> </div>
<div class="line"><a id="l00946" name="l00946"></a><span class="lineno"> 946</span><span class="preprocessor">#endif </span><span class="comment">// WCSLIB_SPC</span></div>
<div class="ttc" id="aspc_8h_html_a006b5cc50a4559c348b544b3288d29c2"><div class="ttname"><a href="spc_8h.html#a006b5cc50a4559c348b544b3288d29c2">spcspxe</a></div><div class="ttdeci">int spcspxe(const char ctypeS[9], double crvalS, double restfrq, double restwav, char *ptype, char *xtype, int *restreq, double *crvalX, double *dXdS, struct wcserr **err)</div><div class="ttdoc">Spectral keyword analysis.</div></div>
<div class="ttc" id="aspc_8h_html_a1c66412136507c5fb3992502a8a7a5b6"><div class="ttname"><a href="spc_8h.html#a1c66412136507c5fb3992502a8a7a5b6">spcsize</a></div><div class="ttdeci">int spcsize(const struct spcprm *spc, int sizes[2])</div><div class="ttdoc">Compute the size of a spcprm struct.</div></div>
<div class="ttc" id="aspc_8h_html_a2e04fc3ccd8aceebb4bfef56c5399a7d"><div class="ttname"><a href="spc_8h.html#a2e04fc3ccd8aceebb4bfef56c5399a7d">spcfree</a></div><div class="ttdeci">int spcfree(struct spcprm *spc)</div><div class="ttdoc">Destructor for the spcprm struct.</div></div>
<div class="ttc" id="aspc_8h_html_a30c95d776068ef3cc959a50af9995fa9"><div class="ttname"><a href="spc_8h.html#a30c95d776068ef3cc959a50af9995fa9">spcini</a></div><div class="ttdeci">int spcini(struct spcprm *spc)</div><div class="ttdoc">Default constructor for the spcprm struct.</div></div>
<div class="ttc" id="aspc_8h_html_a42619bea16461baadc61524f39873f23"><div class="ttname"><a href="spc_8h.html#a42619bea16461baadc61524f39873f23">spcperr</a></div><div class="ttdeci">int spcperr(const struct spcprm *spc, const char *prefix)</div><div class="ttdoc">Print error messages from a spcprm struct.</div></div>
<div class="ttc" id="aspc_8h_html_a467e30a1edcf29d6a096f29f8710395b"><div class="ttname"><a href="spc_8h.html#a467e30a1edcf29d6a096f29f8710395b">spctrn</a></div><div class="ttdeci">int spctrn(const char ctypeS1[9], double crvalS1, double cdeltS1, double restfrq, double restwav, char ctypeS2[9], double *crvalS2, double *cdeltS2)</div></div>
<div class="ttc" id="aspc_8h_html_a51ba1ce5380fd2e7693c37554d18fc3b"><div class="ttname"><a href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3b">spc_errmsg_enum</a></div><div class="ttdeci">spc_errmsg_enum</div><div class="ttdef"><b>Definition</b> spc.h:821</div></div>
<div class="ttc" id="aspc_8h_html_a51ba1ce5380fd2e7693c37554d18fc3ba0653e60411a641a326492c65d257daa8"><div class="ttname"><a href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba0653e60411a641a326492c65d257daa8">SPCERR_BAD_SPEC_PARAMS</a></div><div class="ttdeci">@ SPCERR_BAD_SPEC_PARAMS</div><div class="ttdef"><b>Definition</b> spc.h:825</div></div>
<div class="ttc" id="aspc_8h_html_a51ba1ce5380fd2e7693c37554d18fc3ba0b84f38d1e903eacda3122ce55bff741"><div class="ttname"><a href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba0b84f38d1e903eacda3122ce55bff741">SPCERR_SUCCESS</a></div><div class="ttdeci">@ SPCERR_SUCCESS</div><div class="ttdef"><b>Definition</b> spc.h:823</div></div>
<div class="ttc" id="aspc_8h_html_a51ba1ce5380fd2e7693c37554d18fc3ba3ba9183c7c3dace15eef0606980fd615"><div class="ttname"><a href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba3ba9183c7c3dace15eef0606980fd615">SPCERR_BAD_X</a></div><div class="ttdeci">@ SPCERR_BAD_X</div><div class="ttdef"><b>Definition</b> spc.h:826</div></div>
<div class="ttc" id="aspc_8h_html_a51ba1ce5380fd2e7693c37554d18fc3ba7c5e0d09fac9f441e39f3cf28801961f"><div class="ttname"><a href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba7c5e0d09fac9f441e39f3cf28801961f">SPCERR_NULL_POINTER</a></div><div class="ttdeci">@ SPCERR_NULL_POINTER</div><div class="ttdef"><b>Definition</b> spc.h:824</div></div>
<div class="ttc" id="aspc_8h_html_a51ba1ce5380fd2e7693c37554d18fc3ba7e218c5bd52bd6a45d8ad66573653007"><div class="ttname"><a href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3ba7e218c5bd52bd6a45d8ad66573653007">SPCERR_BAD_SPEC</a></div><div class="ttdeci">@ SPCERR_BAD_SPEC</div><div class="ttdef"><b>Definition</b> spc.h:828</div></div>
<div class="ttc" id="aspc_8h_html_a51ba1ce5380fd2e7693c37554d18fc3bae000828492cbedc0502f757d8b892606"><div class="ttname"><a href="spc_8h.html#a51ba1ce5380fd2e7693c37554d18fc3bae000828492cbedc0502f757d8b892606">SPCERR_NO_CHANGE</a></div><div class="ttdeci">@ SPCERR_NO_CHANGE</div><div class="ttdef"><b>Definition</b> spc.h:822</div></div>
<div class="ttc" id="aspc_8h_html_a5a48828b6fef06053957a51406d31bae"><div class="ttname"><a href="spc_8h.html#a5a48828b6fef06053957a51406d31bae">spctrne</a></div><div class="ttdeci">int spctrne(const char ctypeS1[9], double crvalS1, double cdeltS1, double restfrq, double restwav, char ctypeS2[9], double *crvalS2, double *cdeltS2, struct wcserr **err)</div><div class="ttdoc">Spectral keyword translation.</div></div>
<div class="ttc" id="aspc_8h_html_a6bbde2603e62b96e09576e77ed3446c7"><div class="ttname"><a href="spc_8h.html#a6bbde2603e62b96e09576e77ed3446c7">spcspx</a></div><div class="ttdeci">int spcspx(const char ctypeS[9], double crvalS, double restfrq, double restwav, char *ptype, char *xtype, int *restreq, double *crvalX, double *dXdS)</div></div>
<div class="ttc" id="aspc_8h_html_a7304d0d00bcf9d2bad1f56ba6d8322ea"><div class="ttname"><a href="spc_8h.html#a7304d0d00bcf9d2bad1f56ba6d8322ea">spcprt</a></div><div class="ttdeci">int spcprt(const struct spcprm *spc)</div><div class="ttdoc">Print routine for the spcprm struct.</div></div>
<div class="ttc" id="aspc_8h_html_a96978fec523018fd6898301a3452c166"><div class="ttname"><a href="spc_8h.html#a96978fec523018fd6898301a3452c166">spc_errmsg</a></div><div class="ttdeci">const char * spc_errmsg[]</div><div class="ttdoc">Status return messages.</div></div>
<div class="ttc" id="aspc_8h_html_aa1a03a96e0417b3f5481eb3730386658"><div class="ttname"><a href="spc_8h.html#aa1a03a96e0417b3f5481eb3730386658">spcxps</a></div><div class="ttdeci">int spcxps(const char ctypeS[9], double crvalX, double restfrq, double restwav, char *ptype, char *xtype, int *restreq, double *crvalS, double *dSdX)</div></div>
<div class="ttc" id="aspc_8h_html_aafe9e11caad5ac050e5479041c250a32"><div class="ttname"><a href="spc_8h.html#aafe9e11caad5ac050e5479041c250a32">spctyp</a></div><div class="ttdeci">int spctyp(const char ctype[9], char stype[], char scode[], char sname[], char units[], char *ptype, char *xtype, int *restreq)</div></div>
<div class="ttc" id="aspc_8h_html_ac9dc37c9fdf2db04e23e26b7a51c8e6a"><div class="ttname"><a href="spc_8h.html#ac9dc37c9fdf2db04e23e26b7a51c8e6a">spcaips</a></div><div class="ttdeci">int spcaips(const char ctypeA[9], int velref, char ctype[9], char specsys[9])</div><div class="ttdoc">Translate AIPS-convention spectral keywords.</div></div>
<div class="ttc" id="aspc_8h_html_ae6e89217a5eca87a2101ae195da74347"><div class="ttname"><a href="spc_8h.html#ae6e89217a5eca87a2101ae195da74347">spcs2x</a></div><div class="ttdeci">int spcs2x(struct spcprm *spc, int nspec, int sspec, int sx, const double spec[], double x[], int stat[])</div><div class="ttdoc">Transform spectral coordinates.</div></div>
<div class="ttc" id="aspc_8h_html_ae7fe86ae85a1a3bd19c2d78c3dba58f6"><div class="ttname"><a href="spc_8h.html#ae7fe86ae85a1a3bd19c2d78c3dba58f6">spcx2s</a></div><div class="ttdeci">int spcx2s(struct spcprm *spc, int nx, int sx, int sspec, const double x[], double spec[], int stat[])</div><div class="ttdoc">Transform to spectral coordinates.</div></div>
<div class="ttc" id="aspc_8h_html_aebcf04410f900ba05cb9bf1dcf3f28e8"><div class="ttname"><a href="spc_8h.html#aebcf04410f900ba05cb9bf1dcf3f28e8">spctype</a></div><div class="ttdeci">int spctype(const char ctype[9], char stype[], char scode[], char sname[], char units[], char *ptype, char *xtype, int *restreq, struct wcserr **err)</div><div class="ttdoc">Spectral CTYPEia keyword analysis.</div></div>
<div class="ttc" id="aspc_8h_html_af2ee6399a65f2467841be79e4bbb41c3"><div class="ttname"><a href="spc_8h.html#af2ee6399a65f2467841be79e4bbb41c3">spcset</a></div><div class="ttdeci">int spcset(struct spcprm *spc)</div><div class="ttdoc">Setup routine for the spcprm struct.</div></div>
<div class="ttc" id="aspc_8h_html_afeb4b475bc9b32a7e1047595a3ab67a1"><div class="ttname"><a href="spc_8h.html#afeb4b475bc9b32a7e1047595a3ab67a1">spcxpse</a></div><div class="ttdeci">int spcxpse(const char ctypeS[9], double crvalX, double restfrq, double restwav, char *ptype, char *xtype, int *restreq, double *crvalS, double *dSdX, struct wcserr **err)</div><div class="ttdoc">Spectral keyword synthesis.</div></div>
<div class="ttc" id="aspx_8h_html"><div class="ttname"><a href="spx_8h.html">spx.h</a></div></div>
<div class="ttc" id="aspx_8h_html_a777e5c4790da397aefcada61445a1bb3"><div class="ttname"><a href="spx_8h.html#a777e5c4790da397aefcada61445a1bb3">SPX_ARGS</a></div><div class="ttdeci">#define SPX_ARGS</div><div class="ttdoc">For use in declaring spectral conversion function prototypes.</div><div class="ttdef"><b>Definition</b> spx.h:540</div></div>
<div class="ttc" id="astructspcprm_html"><div class="ttname"><a href="structspcprm.html">spcprm</a></div><div class="ttdoc">Spectral transformation parameters.</div><div class="ttdef"><b>Definition</b> spc.h:832</div></div>
<div class="ttc" id="astructspcprm_html_a20db4194170d78054908acf94b41d9d9"><div class="ttname"><a href="structspcprm.html#a20db4194170d78054908acf94b41d9d9">spcprm::spxX2P</a></div><div class="ttdeci">int(* spxX2P)(SPX_ARGS)</div><div class="ttdef"><b>Definition</b> spc.h:873</div></div>
<div class="ttc" id="astructspcprm_html_a2c5c2d97e6c5f617272834b1516c84de"><div class="ttname"><a href="structspcprm.html#a2c5c2d97e6c5f617272834b1516c84de">spcprm::crval</a></div><div class="ttdeci">double crval</div><div class="ttdef"><b>Definition</b> spc.h:842</div></div>
<div class="ttc" id="astructspcprm_html_a387d74de3215763d7e22c222b19a2c44"><div class="ttname"><a href="structspcprm.html#a387d74de3215763d7e22c222b19a2c44">spcprm::type</a></div><div class="ttdeci">char type[8]</div><div class="ttdef"><b>Definition</b> spc.h:839</div></div>
<div class="ttc" id="astructspcprm_html_a4dbc8c7064ae790483017b6c81e7ded2"><div class="ttname"><a href="structspcprm.html#a4dbc8c7064ae790483017b6c81e7ded2">spcprm::restwav</a></div><div class="ttdeci">double restwav</div><div class="ttdef"><b>Definition</b> spc.h:844</div></div>
<div class="ttc" id="astructspcprm_html_a5f9a48a52144f8ced93baaffc107a3a6"><div class="ttname"><a href="structspcprm.html#a5f9a48a52144f8ced93baaffc107a3a6">spcprm::code</a></div><div class="ttdeci">char code[4]</div><div class="ttdef"><b>Definition</b> spc.h:840</div></div>
<div class="ttc" id="astructspcprm_html_a6727d3a30592e54c7361e0434a795832"><div class="ttname"><a href="structspcprm.html#a6727d3a30592e54c7361e0434a795832">spcprm::spxP2X</a></div><div class="ttdeci">int(* spxP2X)(SPX_ARGS)</div><div class="ttdef"><b>Definition</b> spc.h:878</div></div>
<div class="ttc" id="astructspcprm_html_a6d4124d4db8f7addcbfee99a8634522e"><div class="ttname"><a href="structspcprm.html#a6d4124d4db8f7addcbfee99a8634522e">spcprm::err</a></div><div class="ttdeci">struct wcserr * err</div><div class="ttdef"><b>Definition</b> spc.h:868</div></div>
<div class="ttc" id="astructspcprm_html_a74433ae0e7e1ec426777bafb402b50c4"><div class="ttname"><a href="structspcprm.html#a74433ae0e7e1ec426777bafb402b50c4">spcprm::restfrq</a></div><div class="ttdeci">double restfrq</div><div class="ttdef"><b>Definition</b> spc.h:843</div></div>
<div class="ttc" id="astructspcprm_html_a844792d006c308f465ce8ca593a37df3"><div class="ttname"><a href="structspcprm.html#a844792d006c308f465ce8ca593a37df3">spcprm::padding1</a></div><div class="ttdeci">int padding1</div><div class="ttdef"><b>Definition</b> spc.h:864</div></div>
<div class="ttc" id="astructspcprm_html_a8ef0c963f1b0ee957f3403da7559a81c"><div class="ttname"><a href="structspcprm.html#a8ef0c963f1b0ee957f3403da7559a81c">spcprm::w</a></div><div class="ttdeci">double w[6]</div><div class="ttdef"><b>Definition</b> spc.h:857</div></div>
<div class="ttc" id="astructspcprm_html_aa38c41f28ffff233bc7ffa0f3947b075"><div class="ttname"><a href="structspcprm.html#aa38c41f28ffff233bc7ffa0f3947b075">spcprm::padding2</a></div><div class="ttdeci">void * padding2</div><div class="ttdef"><b>Definition</b> spc.h:872</div></div>
<div class="ttc" id="astructspcprm_html_add01b70b4a074a7bdccff378ab61a948"><div class="ttname"><a href="structspcprm.html#add01b70b4a074a7bdccff378ab61a948">spcprm::spxP2S</a></div><div class="ttdeci">int(* spxP2S)(SPX_ARGS)</div><div class="ttdef"><b>Definition</b> spc.h:874</div></div>
<div class="ttc" id="astructspcprm_html_ae11db8d7ff8b605eed87298a32fd094d"><div class="ttname"><a href="structspcprm.html#ae11db8d7ff8b605eed87298a32fd094d">spcprm::pv</a></div><div class="ttdeci">double pv[7]</div><div class="ttdef"><b>Definition</b> spc.h:846</div></div>
<div class="ttc" id="astructspcprm_html_aec5d37c00d382a84a090d4f52d9a4346"><div class="ttname"><a href="structspcprm.html#aec5d37c00d382a84a090d4f52d9a4346">spcprm::isGrism</a></div><div class="ttdeci">int isGrism</div><div class="ttdef"><b>Definition</b> spc.h:863</div></div>
<div class="ttc" id="astructspcprm_html_afb6a33994ad13f402efb68d20a97eee1"><div class="ttname"><a href="structspcprm.html#afb6a33994ad13f402efb68d20a97eee1">spcprm::spxS2P</a></div><div class="ttdeci">int(* spxS2P)(SPX_ARGS)</div><div class="ttdef"><b>Definition</b> spc.h:877</div></div>
<div class="ttc" id="astructspcprm_html_afeeb5f4056f271fd37291a712a7b6791"><div class="ttname"><a href="structspcprm.html#afeeb5f4056f271fd37291a712a7b6791">spcprm::flag</a></div><div class="ttdeci">int flag</div><div class="ttdef"><b>Definition</b> spc.h:835</div></div>
<div class="ttc" id="astructwcserr_html"><div class="ttname"><a href="structwcserr.html">wcserr</a></div><div class="ttdoc">Error message handling.</div><div class="ttdef"><b>Definition</b> wcserr.h:243</div></div>
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