wcslib (8.2.2)
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<a href="lin_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: lin.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 lin 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 apply the linear transformation defined by the FITS</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno"> 33</span><span class="comment">* World Coordinate System (WCS) standard, 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">* These routines are based on the linprm struct which contains all information</span></div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno"> 39</span><span class="comment">* needed for the computations. The struct contains some members that must be</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"> 40</span><span class="comment">* set by the user, and others that are maintained by these routines, somewhat</span></div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno"> 41</span><span class="comment">* like a C++ class but with no encapsulation.</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno"> 42</span><span class="comment">*</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno"> 43</span><span class="comment">* Six routines, linini(), lininit(), lindis(), lindist() lincpy(), and</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno"> 44</span><span class="comment">* linfree() are provided to manage the linprm struct, linsize() computes its</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"> 45</span><span class="comment">* total size including allocated memory, and linprt() prints its contents.</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno"> 46</span><span class="comment">*</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno"> 47</span><span class="comment">* linperr() prints the error message(s) (if any) stored in a linprm struct,</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno"> 48</span><span class="comment">* and the disprm structs that it may contain.</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">* A setup routine, linset(), computes intermediate values in the linprm struct</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno"> 51</span><span class="comment">* from parameters in it that were supplied by the user. The struct always</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno"> 52</span><span class="comment">* needs to be set up by linset() but need not be called explicitly - refer to</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno"> 53</span><span class="comment">* the explanation of linprm::flag.</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">* linp2x() and linx2p() implement the WCS linear transformations.</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">* An auxiliary routine, linwarp(), computes various measures of the distortion</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno"> 58</span><span class="comment">* over a specified range of pixel coordinates.</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"> 59</span><span class="comment">*</span></div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno"> 60</span><span class="comment">* An auxiliary matrix inversion routine, matinv(), is included. It uses</span></div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno"> 61</span><span class="comment">* LU-triangular factorization with scaled partial pivoting.</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"> 62</span><span class="comment">*</span></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno"> 63</span><span class="comment">*</span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno"> 64</span><span class="comment">* linini() - Default constructor for the linprm struct</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">* linini() is a thin wrapper on lininit(). It invokes it with ndpmax set</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno"> 67</span><span class="comment">* to -1 which causes it to use the value of the global variable NDPMAX. It</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno"> 68</span><span class="comment">* is thereby potentially thread-unsafe if NDPMAX is altered dynamically via</span></div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno"> 69</span><span class="comment">* disndp(). Use lininit() for a thread-safe alternative in this case.</span></div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno"> 70</span><span class="comment">*</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">* lininit() - Default constructor for the linprm struct</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno"> 73</span><span class="comment">* -----------------------------------------------------</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno"> 74</span><span class="comment">* lininit() allocates memory for arrays in a linprm struct and sets all</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno"> 75</span><span class="comment">* members of the struct to default values.</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno"> 76</span><span class="comment">*</span></div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno"> 77</span><span class="comment">* PLEASE NOTE: every linprm struct must be initialized by lininit(), possibly</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno"> 78</span><span class="comment">* repeatedly. On the first invokation, and only the first invokation,</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno"> 79</span><span class="comment">* linprm::flag must be set to -1 to initialize memory management, regardless</span></div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno"> 80</span><span class="comment">* of whether lininit() will actually be used to allocate memory.</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno"> 81</span><span class="comment">*</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno"> 82</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno"> 83</span><span class="comment">* alloc int If true, allocate memory unconditionally for arrays in</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno"> 84</span><span class="comment">* the linprm struct.</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">* If false, it is assumed that pointers to these arrays</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno"> 87</span><span class="comment">* have been set by the user except if they are null</span></div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno"> 88</span><span class="comment">* pointers in which case memory will be allocated for</span></div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno"> 89</span><span class="comment">* them regardless. (In other words, setting alloc true</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno"> 90</span><span class="comment">* saves having to initalize these pointers to zero.)</span></div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno"> 91</span><span class="comment">*</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno"> 92</span><span class="comment">* naxis int The number of world coordinate axes, used to determine</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno"> 93</span><span class="comment">* array sizes.</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">* Given and returned:</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno"> 96</span><span class="comment">* lin struct linprm*</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno"> 97</span><span class="comment">* Linear transformation parameters. Note that, in order</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno"> 98</span><span class="comment">* to initialize memory management linprm::flag should be</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno"> 99</span><span class="comment">* set to -1 when lin is initialized for the first time</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno"> 100</span><span class="comment">* (memory leaks may result if it had already been</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno"> 101</span><span class="comment">* initialized).</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno"> 102</span><span class="comment">*</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno"> 103</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno"> 104</span><span class="comment">* ndpmax int The number of DPja or DQia keywords to allocate space</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno"> 105</span><span class="comment">* for. If set to -1, the value of the global variable</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno"> 106</span><span class="comment">* NDPMAX will be used. This is potentially</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno"> 107</span><span class="comment">* thread-unsafe if disndp() is being used dynamically to</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno"> 108</span><span class="comment">* alter its value.</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">* Function return value:</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno"> 111</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno"> 112</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno"> 113</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"> 114</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno"> 115</span><span class="comment">*</span></div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno"> 116</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno"> 117</span><span class="comment">* linprm::err if enabled, see wcserr_enable().</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">*</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno"> 120</span><span class="comment">* lindis() - Assign a distortion to a linprm struct</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">* lindis() is a thin wrapper on lindist(). It invokes it with ndpmax set</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno"> 123</span><span class="comment">* to -1 which causes the value of the global variable NDPMAX to be used (by</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"> 124</span><span class="comment">* disinit()). It is thereby potentially thread-unsafe if NDPMAX is altered</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno"> 125</span><span class="comment">* dynamically via disndp(). Use lindist() for a thread-safe alternative in</span></div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno"> 126</span><span class="comment">* this case.</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">*</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno"> 129</span><span class="comment">* lindist() - Assign a distortion to a linprm struct</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">* lindist() may be used to assign the address of a disprm struct to</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno"> 132</span><span class="comment">* linprm::dispre or linprm::disseq. The linprm struct must already have been</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno"> 133</span><span class="comment">* initialized by lininit().</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"> 134</span><span class="comment">*</span></div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno"> 135</span><span class="comment">* The disprm struct must have been allocated from the heap (e.g. using</span></div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno"> 136</span><span class="comment">* malloc(), calloc(), etc.). lindist() will immediately initialize it via a</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno"> 137</span><span class="comment">* call to disini() using the value of linprm::naxis. Subsequently, it will be</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno"> 138</span><span class="comment">* reinitialized by calls to lininit(), and freed by linfree(), neither of</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno"> 139</span><span class="comment">* which would happen if the disprm struct was assigned directly.</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno"> 140</span><span class="comment">*</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"> 141</span><span class="comment">* If the disprm struct had previously been assigned via lindist(), it will be</span></div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno"> 142</span><span class="comment">* freed before reassignment. It is also permissable for a null disprm pointer</span></div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno"> 143</span><span class="comment">* to be assigned to disable the distortion correction.</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno"> 144</span><span class="comment">*</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno"> 145</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno"> 146</span><span class="comment">* sequence int Is it a prior or sequent distortion?</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno"> 147</span><span class="comment">* 1: Prior, the assignment is to linprm::dispre.</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno"> 148</span><span class="comment">* 2: Sequent, the assignment is to linprm::disseq.</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">* Anything else is an error.</span></div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno"> 151</span><span class="comment">*</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno"> 152</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno"> 153</span><span class="comment">* lin struct linprm*</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno"> 154</span><span class="comment">* Linear transformation parameters.</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno"> 155</span><span class="comment">*</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno"> 156</span><span class="comment">* dis struct disprm*</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno"> 157</span><span class="comment">* Distortion function parameters.</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">* Given:</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"> 160</span><span class="comment">* ndpmax int The number of DPja or DQia keywords to allocate space</span></div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno"> 161</span><span class="comment">* for. If set to -1, the value of the global variable</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno"> 162</span><span class="comment">* NDPMAX will be used. This is potentially</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno"> 163</span><span class="comment">* thread-unsafe if disndp() is being used dynamically to</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno"> 164</span><span class="comment">* alter its value.</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno"> 165</span><span class="comment">*</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno"> 166</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno"> 167</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno"> 168</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno"> 169</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno"> 170</span><span class="comment">* 4: Invalid sequence.</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">*</span></div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno"> 173</span><span class="comment">* lincpy() - Copy routine for the linprm struct</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno"> 174</span><span class="comment">* ---------------------------------------------</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno"> 175</span><span class="comment">* lincpy() does a deep copy of one linprm struct to another, using lininit()</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno"> 176</span><span class="comment">* to allocate memory for its arrays if required. Only the "information to be</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno"> 177</span><span class="comment">* provided" part of the struct is copied; a call to linset() is required to</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno"> 178</span><span class="comment">* initialize the remainder.</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno"> 179</span><span class="comment">*</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno"> 180</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno"> 181</span><span class="comment">* alloc int If true, allocate memory for the crpix, pc, and cdelt</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno"> 182</span><span class="comment">* arrays in the destination. Otherwise, it is assumed</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"> 183</span><span class="comment">* that pointers to these arrays have been set by the</span></div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno"> 184</span><span class="comment">* user except if they are null pointers in which case</span></div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno"> 185</span><span class="comment">* memory will be allocated for them regardless.</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno"> 186</span><span class="comment">*</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno"> 187</span><span class="comment">* linsrc const struct linprm*</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno"> 188</span><span class="comment">* Struct to copy from.</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno"> 189</span><span class="comment">*</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno"> 190</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"> 191</span><span class="comment">* lindst struct linprm*</span></div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno"> 192</span><span class="comment">* Struct to copy to. linprm::flag should be set to -1</span></div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno"> 193</span><span class="comment">* if lindst was not previously initialized (memory leaks</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno"> 194</span><span class="comment">* may result if it was previously initialized).</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno"> 195</span><span class="comment">*</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno"> 196</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno"> 197</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"> 198</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno"> 199</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno"> 200</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno"> 201</span><span class="comment">*</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno"> 202</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno"> 203</span><span class="comment">* linprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno"> 204</span><span class="comment">*</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno"> 205</span><span class="comment">*</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno"> 206</span><span class="comment">* linfree() - Destructor for the linprm struct</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">* linfree() frees memory allocated for the linprm arrays by lininit() and/or</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno"> 209</span><span class="comment">* linset(). lininit() keeps a record of the memory it allocates and linfree()</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno"> 210</span><span class="comment">* will only attempt to free this.</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno"> 211</span><span class="comment">*</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno"> 212</span><span class="comment">* PLEASE NOTE: linfree() must not be invoked on a linprm struct that was not</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno"> 213</span><span class="comment">* initialized by lininit().</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"> 214</span><span class="comment">*</span></div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno"> 215</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno"> 216</span><span class="comment">* lin struct linprm*</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno"> 217</span><span class="comment">* Linear transformation parameters.</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">* Function return value:</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"> 220</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno"> 221</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno"> 222</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno"> 223</span><span class="comment">*</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno"> 224</span><span class="comment">*</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno"> 225</span><span class="comment">* linsize() - Compute the size of a linprm struct</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"> 226</span><span class="comment">* -----------------------------------------------</span></div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno"> 227</span><span class="comment">* linsize() computes the full size of a linprm struct, including allocated</span></div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno"> 228</span><span class="comment">* memory.</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno"> 229</span><span class="comment">*</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno"> 230</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno"> 231</span><span class="comment">* lin const struct linprm*</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno"> 232</span><span class="comment">* Linear transformation parameters.</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"> 233</span><span class="comment">*</span></div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno"> 234</span><span class="comment">* If NULL, the base size of the struct and the allocated</span></div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno"> 235</span><span class="comment">* size are both set to zero.</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno"> 236</span><span class="comment">*</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno"> 237</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno"> 238</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="l00239" name="l00239"></a><span class="lineno"> 239</span><span class="comment">* returned by sizeof(struct linprm).</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">* The second element is the total size of memory</span></div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno"> 242</span><span class="comment">* allocated in the struct, in bytes, assuming that the</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno"> 243</span><span class="comment">* allocation was done by linini(). This figure includes</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno"> 244</span><span class="comment">* memory allocated for members of constituent structs,</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno"> 245</span><span class="comment">* such as linprm::dispre.</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno"> 246</span><span class="comment">*</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno"> 247</span><span class="comment">* It is not an error for the struct not to have been set</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"> 248</span><span class="comment">* up via linset(), which normally results in additional</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno"> 249</span><span class="comment">* memory allocation.</span></div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno"> 250</span><span class="comment">*</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno"> 251</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno"> 252</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno"> 253</span><span class="comment">* 0: Success.</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">* linprt() - Print routine for the linprm 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">* linprt() prints the contents of a linprm struct using wcsprintf(). Mainly</span></div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno"> 259</span><span class="comment">* intended for diagnostic purposes.</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">* lin const struct linprm*</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno"> 263</span><span class="comment">* Linear 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">* Function return value:</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno"> 266</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"> 267</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno"> 268</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno"> 269</span><span class="comment">*</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"> 270</span><span class="comment">*</span></div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno"> 271</span><span class="comment">* linperr() - Print error messages from a linprm struct</span></div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno"> 272</span><span class="comment">* -----------------------------------------------------</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno"> 273</span><span class="comment">* linperr() prints the error message(s) (if any) stored in a linprm struct,</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno"> 274</span><span class="comment">* and the disprm structs that it may contain. If there are no errors then</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno"> 275</span><span class="comment">* nothing is printed. It uses wcserr_prt(), q.v.</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">* Given:</span></div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno"> 278</span><span class="comment">* lin const struct linprm*</span></div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno"> 279</span><span class="comment">* Coordinate transformation parameters.</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno"> 280</span><span class="comment">*</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno"> 281</span><span class="comment">* prefix const char *</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno"> 282</span><span class="comment">* If non-NULL, each output line will be prefixed with</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno"> 283</span><span class="comment">* this string.</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno"> 284</span><span class="comment">*</span></div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno"> 285</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno"> 286</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno"> 287</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno"> 288</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno"> 289</span><span class="comment">*</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno"> 290</span><span class="comment">*</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno"> 291</span><span class="comment">* linset() - Setup routine for the linprm struct</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno"> 292</span><span class="comment">* ----------------------------------------------</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno"> 293</span><span class="comment">* linset(), if necessary, allocates memory for the linprm::piximg and</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno"> 294</span><span class="comment">* linprm::imgpix arrays and sets up the linprm struct according to information</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno"> 295</span><span class="comment">* supplied within it - refer to the explanation of linprm::flag.</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">* Note that this routine need not be called directly; it will be invoked by</span></div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno"> 298</span><span class="comment">* linp2x() and linx2p() if the linprm::flag is anything other than a</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"> 299</span><span class="comment">* predefined magic value.</span></div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno"> 300</span><span class="comment">*</span></div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno"> 301</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno"> 302</span><span class="comment">* lin struct linprm*</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno"> 303</span><span class="comment">* Linear transformation parameters.</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno"> 304</span><span class="comment">*</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno"> 305</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"> 306</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno"> 307</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno"> 308</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno"> 309</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno"> 310</span><span class="comment">* 3: PCi_ja matrix is singular.</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno"> 311</span><span class="comment">* 4: Failed to initialise distortions.</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">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno"> 314</span><span class="comment">* linprm::err if enabled, see wcserr_enable().</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">*</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno"> 317</span><span class="comment">* linp2x() - Pixel-to-world linear transformation</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">* linp2x() transforms pixel coordinates to intermediate world coordinates.</span></div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno"> 320</span><span class="comment">*</span></div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno"> 321</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno"> 322</span><span class="comment">* lin struct linprm*</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno"> 323</span><span class="comment">* Linear transformation parameters.</span></div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno"> 324</span><span class="comment">*</span></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno"> 325</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno"> 326</span><span class="comment">* ncoord,</span></div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno"> 327</span><span class="comment">* nelem int The number of coordinates, each of vector length nelem</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno"> 328</span><span class="comment">* but containing lin.naxis coordinate elements.</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno"> 329</span><span class="comment">*</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno"> 330</span><span class="comment">* pixcrd const double[ncoord][nelem]</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno"> 331</span><span class="comment">* Array of pixel coordinates.</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno"> 332</span><span class="comment">*</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno"> 333</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno"> 334</span><span class="comment">* imgcrd double[ncoord][nelem]</span></div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno"> 335</span><span class="comment">* Array of intermediate world 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">* Function return value:</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno"> 338</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno"> 339</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno"> 340</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno"> 341</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno"> 342</span><span class="comment">* 3: PCi_ja matrix is singular.</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno"> 343</span><span class="comment">* 4: Failed to initialise distortions.</span></div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno"> 344</span><span class="comment">* 5: Distort error.</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno"> 345</span><span class="comment">*</span></div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno"> 346</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno"> 347</span><span class="comment">* linprm::err if enabled, see wcserr_enable().</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">* Notes:</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno"> 350</span><span class="comment">* 1. Historically, the API to linp2x() did not have a stat[] vector because</span></div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno"> 351</span><span class="comment">* a valid linear transformation should always succeed. However, now that</span></div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno"> 352</span><span class="comment">* it invokes disp2x() if distortions are present, it does have the</span></div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno"> 353</span><span class="comment">* potential to fail. Consequently, when distortions are present and a</span></div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno"> 354</span><span class="comment">* status return (stat[]) is required for each coordinate, then linp2x()</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno"> 355</span><span class="comment">* should be invoked separately for each of them.</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">*</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno"> 358</span><span class="comment">* linx2p() - World-to-pixel linear transformation</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno"> 359</span><span class="comment">* -----------------------------------------------</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno"> 360</span><span class="comment">* linx2p() transforms intermediate world coordinates to pixel coordinates.</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno"> 361</span><span class="comment">*</span></div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno"> 362</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno"> 363</span><span class="comment">* lin struct linprm*</span></div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno"> 364</span><span class="comment">* Linear transformation parameters.</span></div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno"> 365</span><span class="comment">*</span></div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno"> 366</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno"> 367</span><span class="comment">* ncoord,</span></div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno"> 368</span><span class="comment">* nelem int The number of coordinates, each of vector length nelem</span></div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno"> 369</span><span class="comment">* but containing lin.naxis coordinate elements.</span></div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno"> 370</span><span class="comment">*</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno"> 371</span><span class="comment">* imgcrd const double[ncoord][nelem]</span></div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno"> 372</span><span class="comment">* Array of intermediate world coordinates.</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno"> 373</span><span class="comment">*</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno"> 374</span><span class="comment">* Returned:</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno"> 375</span><span class="comment">* pixcrd double[ncoord][nelem]</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno"> 376</span><span class="comment">* Array of pixel coordinates.</span></div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno"> 377</span><span class="comment">*</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno"> 378</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno"> 379</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno"> 380</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno"> 381</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno"> 382</span><span class="comment">* 3: PCi_ja matrix is singular.</span></div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno"> 383</span><span class="comment">* 4: Failed to initialise distortions.</span></div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno"> 384</span><span class="comment">* 6: De-distort error.</span></div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno"> 385</span><span class="comment">*</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno"> 386</span><span class="comment">* For returns > 1, a detailed error message is set in</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno"> 387</span><span class="comment">* linprm::err if enabled, see wcserr_enable().</span></div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno"> 388</span><span class="comment">*</span></div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno"> 389</span><span class="comment">* Notes:</span></div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno"> 390</span><span class="comment">* 1. Historically, the API to linx2p() did not have a stat[] vector because</span></div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno"> 391</span><span class="comment">* a valid linear transformation should always succeed. However, now that</span></div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno"> 392</span><span class="comment">* it invokes disx2p() if distortions are present, it does have the</span></div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno"> 393</span><span class="comment">* potential to fail. Consequently, when distortions are present and a</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno"> 394</span><span class="comment">* status return (stat[]) is required for each coordinate, then linx2p()</span></div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno"> 395</span><span class="comment">* should be invoked separately for each of them.</span></div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno"> 396</span><span class="comment">*</span></div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno"> 397</span><span class="comment">*</span></div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno"> 398</span><span class="comment">* linwarp() - Compute measures of distortion</span></div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno"> 399</span><span class="comment">* ------------------------------------------</span></div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno"> 400</span><span class="comment">* linwarp() computes various measures of the distortion over a specified range</span></div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno"> 401</span><span class="comment">* of pixel coordinates.</span></div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno"> 402</span><span class="comment">*</span></div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno"> 403</span><span class="comment">* All distortion measures are specified as an offset in pixel coordinates,</span></div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno"> 404</span><span class="comment">* as given directly by prior distortions. The offset in intermediate pixel</span></div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno"> 405</span><span class="comment">* coordinates given by sequent distortions is translated back to pixel</span></div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno"> 406</span><span class="comment">* coordinates by applying the inverse of the linear transformation matrix</span></div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno"> 407</span><span class="comment">* (PCi_ja or CDi_ja). The difference may be significant if the matrix</span></div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno"> 408</span><span class="comment">* introduced a scaling.</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">* If all distortions are prior, then linwarp() uses diswarp(), q.v.</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno"> 411</span><span class="comment">*</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno"> 412</span><span class="comment">* Given and returned:</span></div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno"> 413</span><span class="comment">* lin struct linprm*</span></div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno"> 414</span><span class="comment">* Linear transformation parameters plus distortions.</span></div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno"> 415</span><span class="comment">*</span></div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno"> 416</span><span class="comment">* Given:</span></div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno"> 417</span><span class="comment">* pixblc const double[naxis]</span></div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno"> 418</span><span class="comment">* Start of the range of pixel coordinates (i.e. "bottom</span></div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno"> 419</span><span class="comment">* left-hand corner" in the conventional FITS image</span></div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno"> 420</span><span class="comment">* display orientation). May be specified as a NULL</span></div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno"> 421</span><span class="comment">* pointer which is interpreted as (1,1,...).</span></div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno"> 422</span><span class="comment">*</span></div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno"> 423</span><span class="comment">* pixtrc const double[naxis]</span></div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno"> 424</span><span class="comment">* End of the range of pixel coordinates (i.e. "top</span></div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno"> 425</span><span class="comment">* right-hand corner" in the conventional FITS image</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno"> 426</span><span class="comment">* display orientation).</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno"> 427</span><span class="comment">*</span></div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno"> 428</span><span class="comment">* pixsamp const double[naxis]</span></div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno"> 429</span><span class="comment">* If positive or zero, the increment on the particular</span></div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno"> 430</span><span class="comment">* axis, starting at pixblc[]. Zero is interpreted as a</span></div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno"> 431</span><span class="comment">* unit increment. pixsamp may also be specified as a</span></div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno"> 432</span><span class="comment">* NULL pointer which is interpreted as all zeroes, i.e.</span></div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno"> 433</span><span class="comment">* unit increments on all axes.</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">* If negative, the grid size on the particular axis (the</span></div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno"> 436</span><span class="comment">* absolute value being rounded to the nearest integer).</span></div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno"> 437</span><span class="comment">* For example, if pixsamp is (-128.0,-128.0,...) then</span></div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno"> 438</span><span class="comment">* each axis will be sampled at 128 points between</span></div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno"> 439</span><span class="comment">* pixblc[] and pixtrc[] inclusive. Use caution when</span></div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno"> 440</span><span class="comment">* using this option on non-square images.</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">* Returned:</span></div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno"> 443</span><span class="comment">* nsamp int* The number of pixel coordinates sampled.</span></div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno"> 444</span><span class="comment">*</span></div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno"> 445</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno"> 446</span><span class="comment">*</span></div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno"> 447</span><span class="comment">* maxdis double[naxis]</span></div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno"> 448</span><span class="comment">* For each individual distortion function, the</span></div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno"> 449</span><span class="comment">* maximum absolute value of the distortion.</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">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno"> 452</span><span class="comment">*</span></div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno"> 453</span><span class="comment">* maxtot double* For the combination of all distortion functions, the</span></div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno"> 454</span><span class="comment">* maximum absolute value of the distortion.</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">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno"> 457</span><span class="comment">*</span></div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno"> 458</span><span class="comment">* avgdis double[naxis]</span></div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno"> 459</span><span class="comment">* For each individual distortion function, the</span></div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno"> 460</span><span class="comment">* mean value of the distortion.</span></div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno"> 461</span><span class="comment">*</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno"> 462</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno"> 463</span><span class="comment">*</span></div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno"> 464</span><span class="comment">* avgtot double* For the combination of all distortion functions, the</span></div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno"> 465</span><span class="comment">* mean value of the distortion.</span></div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno"> 466</span><span class="comment">*</span></div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno"> 467</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno"> 468</span><span class="comment">*</span></div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno"> 469</span><span class="comment">* rmsdis double[naxis]</span></div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno"> 470</span><span class="comment">* For each individual distortion function, the</span></div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno"> 471</span><span class="comment">* root mean square deviation of the distortion.</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">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno"> 474</span><span class="comment">*</span></div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno"> 475</span><span class="comment">* rmstot double* For the combination of all distortion functions, the</span></div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno"> 476</span><span class="comment">* root mean square deviation of the distortion.</span></div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno"> 477</span><span class="comment">*</span></div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno"> 478</span><span class="comment">* Can be specified as a NULL pointer if not required.</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno"> 479</span><span class="comment">*</span></div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno"> 480</span><span class="comment">* Function return value:</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno"> 481</span><span class="comment">* int Status return value:</span></div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno"> 482</span><span class="comment">* 0: Success.</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno"> 483</span><span class="comment">* 1: Null linprm pointer passed.</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno"> 484</span><span class="comment">* 2: Memory allocation failed.</span></div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno"> 485</span><span class="comment">* 3: Invalid parameter.</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno"> 486</span><span class="comment">* 4: Distort error.</span></div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno"> 487</span><span class="comment">*</span></div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno"> 488</span><span class="comment">*</span></div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno"> 489</span><span class="comment">* linprm struct - Linear transformation parameters</span></div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno"> 490</span><span class="comment">* ------------------------------------------------</span></div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno"> 491</span><span class="comment">* The linprm struct contains all of the information required to perform a</span></div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno"> 492</span><span class="comment">* linear transformation. It consists of certain members that must be set by</span></div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno"> 493</span><span class="comment">* the user ("given") and others that are set by the WCSLIB routines</span></div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno"> 494</span><span class="comment">* ("returned").</span></div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno"> 495</span><span class="comment">*</span></div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno"> 496</span><span class="comment">* int flag</span></div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno"> 497</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="l00498" name="l00498"></a><span class="lineno"> 498</span><span class="comment">* following members of the linprm struct are set or modified:</span></div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno"> 499</span><span class="comment">*</span></div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno"> 500</span><span class="comment">* - linprm::naxis (q.v., not normally set by the user),</span></div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno"> 501</span><span class="comment">* - linprm::pc,</span></div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno"> 502</span><span class="comment">* - linprm::cdelt,</span></div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno"> 503</span><span class="comment">* - linprm::dispre.</span></div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno"> 504</span><span class="comment">* - linprm::disseq.</span></div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno"> 505</span><span class="comment">*</span></div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno"> 506</span><span class="comment">* This signals the initialization routine, linset(), to recompute the</span></div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno"> 507</span><span class="comment">* returned members of the linprm struct. linset() will reset flag to</span></div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno"> 508</span><span class="comment">* indicate that this has been done.</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">* PLEASE NOTE: flag should be set to -1 when lininit() is called for the</span></div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno"> 511</span><span class="comment">* first time for a particular linprm struct in order to initialize memory</span></div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno"> 512</span><span class="comment">* management. It must ONLY be used on the first initialization otherwise</span></div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno"> 513</span><span class="comment">* memory leaks may result.</span></div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno"> 514</span><span class="comment">*</span></div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno"> 515</span><span class="comment">* int naxis</span></div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno"> 516</span><span class="comment">* (Given or returned) Number of pixel and world coordinate elements.</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">* If lininit() is used to initialize the linprm struct (as would normally</span></div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno"> 519</span><span class="comment">* be the case) then it will set naxis from the value passed to it as a</span></div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno"> 520</span><span class="comment">* function argument. The user should not subsequently modify it.</span></div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno"> 521</span><span class="comment">*</span></div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno"> 522</span><span class="comment">* double *crpix</span></div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno"> 523</span><span class="comment">* (Given) Pointer to the first element of an array of double containing</span></div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno"> 524</span><span class="comment">* the coordinate reference pixel, CRPIXja.</span></div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno"> 525</span><span class="comment">*</span></div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno"> 526</span><span class="comment">* It is not necessary to reset the linprm struct (via linset()) when</span></div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno"> 527</span><span class="comment">* linprm::crpix is changed.</span></div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno"> 528</span><span class="comment">*</span></div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno"> 529</span><span class="comment">* double *pc</span></div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno"> 530</span><span class="comment">* (Given) Pointer to the first element of the PCi_ja (pixel coordinate)</span></div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno"> 531</span><span class="comment">* transformation matrix. The expected order is</span></div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno"> 532</span><span class="comment">*</span></div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno"> 533</span><span class="comment">= struct linprm lin;</span></div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno"> 534</span><span class="comment">= lin.pc = {PC1_1, PC1_2, PC2_1, PC2_2};</span></div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno"> 535</span><span class="comment">*</span></div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno"> 536</span><span class="comment">* This may be constructed conveniently from a 2-D array via</span></div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno"> 537</span><span class="comment">*</span></div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno"> 538</span><span class="comment">= double m[2][2] = {{PC1_1, PC1_2},</span></div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno"> 539</span><span class="comment">= {PC2_1, PC2_2}};</span></div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno"> 540</span><span class="comment">*</span></div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno"> 541</span><span class="comment">* which is equivalent to</span></div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno"> 542</span><span class="comment">*</span></div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno"> 543</span><span class="comment">= double m[2][2];</span></div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno"> 544</span><span class="comment">= m[0][0] = PC1_1;</span></div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno"> 545</span><span class="comment">= m[0][1] = PC1_2;</span></div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno"> 546</span><span class="comment">= m[1][0] = PC2_1;</span></div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno"> 547</span><span class="comment">= m[1][1] = PC2_2;</span></div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno"> 548</span><span class="comment">*</span></div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno"> 549</span><span class="comment">* The storage order for this 2-D array is the same as for the 1-D array,</span></div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno"> 550</span><span class="comment">* whence</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">= lin.pc = *m;</span></div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno"> 553</span><span class="comment">*</span></div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno"> 554</span><span class="comment">* would be legitimate.</span></div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno"> 555</span><span class="comment">*</span></div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno"> 556</span><span class="comment">* double *cdelt</span></div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno"> 557</span><span class="comment">* (Given) Pointer to the first element of an array of double containing</span></div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno"> 558</span><span class="comment">* the coordinate increments, CDELTia.</span></div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno"> 559</span><span class="comment">*</span></div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno"> 560</span><span class="comment">* struct disprm *dispre</span></div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno"> 561</span><span class="comment">* (Given) Pointer to a disprm struct holding parameters for prior</span></div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno"> 562</span><span class="comment">* distortion functions, or a null (0x0) pointer if there are none.</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 lindist() may be used to assign a disprm pointer to a linprm</span></div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno"> 565</span><span class="comment">* struct, allowing it to take control of any memory allocated for it, as</span></div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno"> 566</span><span class="comment">* in the following example:</span></div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno"> 567</span><span class="comment">*</span></div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno"> 568</span><span class="comment">= void add_distortion(struct linprm *lin)</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">= struct disprm *dispre;</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">= dispre = malloc(sizeof(struct disprm));</span></div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno"> 573</span><span class="comment">= dispre->flag = -1;</span></div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno"> 574</span><span class="comment">= lindist(1, lin, dispre, ndpmax);</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">= (Set up dispre.)</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">=</span></div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno"> 579</span><span class="comment">= return;</span></div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno"> 580</span><span class="comment">= }</span></div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno"> 581</span><span class="comment">*</span></div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno"> 582</span><span class="comment">* Here, after the distortion function parameters etc. are copied into</span></div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno"> 583</span><span class="comment">* dispre, dispre is assigned using lindist() which takes control of the</span></div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno"> 584</span><span class="comment">* allocated memory. It will be freed later when linfree() is invoked on</span></div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno"> 585</span><span class="comment">* the linprm struct.</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">* Consider also the following erroneous code:</span></div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno"> 588</span><span class="comment">*</span></div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno"> 589</span><span class="comment">= void bad_code(struct linprm *lin)</span></div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno"> 590</span><span class="comment">= {</span></div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno"> 591</span><span class="comment">= struct disprm dispre;</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">= dispre.flag = -1;</span></div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno"> 594</span><span class="comment">= lindist(1, lin, &dispre, ndpmax); // WRONG.</span></div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno"> 595</span><span class="comment">= :</span></div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno"> 596</span><span class="comment">=</span></div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno"> 597</span><span class="comment">= return;</span></div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno"> 598</span><span class="comment">= }</span></div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno"> 599</span><span class="comment">*</span></div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno"> 600</span><span class="comment">* Here, dispre is declared as a struct, rather than a pointer. When the</span></div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno"> 601</span><span class="comment">* function returns, dispre will go out of scope and its memory will most</span></div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno"> 602</span><span class="comment">* likely be reused, thereby trashing its contents. Later, a segfault will</span></div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno"> 603</span><span class="comment">* occur when linfree() tries to free dispre's stale address.</span></div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno"> 604</span><span class="comment">*</span></div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno"> 605</span><span class="comment">* struct disprm *disseq</span></div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno"> 606</span><span class="comment">* (Given) Pointer to a disprm struct holding parameters for sequent</span></div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno"> 607</span><span class="comment">* distortion functions, or a null (0x0) pointer if there are none.</span></div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno"> 608</span><span class="comment">*</span></div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno"> 609</span><span class="comment">* Refer to the comments and examples given for disprm::dispre.</span></div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno"> 610</span><span class="comment">*</span></div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno"> 611</span><span class="comment">* double *piximg</span></div>
<div class="line"><a id="l00612" name="l00612"></a><span class="lineno"> 612</span><span class="comment">* (Returned) Pointer to the first element of the matrix containing the</span></div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno"> 613</span><span class="comment">* product of the CDELTia diagonal matrix and the PCi_ja matrix.</span></div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno"> 614</span><span class="comment">*</span></div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno"> 615</span><span class="comment">* double *imgpix</span></div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno"> 616</span><span class="comment">* (Returned) Pointer to the first element of the inverse of the</span></div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno"> 617</span><span class="comment">* linprm::piximg matrix.</span></div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno"> 618</span><span class="comment">*</span></div>
<div class="line"><a id="l00619" name="l00619"></a><span class="lineno"> 619</span><span class="comment">* int i_naxis</span></div>
<div class="line"><a id="l00620" name="l00620"></a><span class="lineno"> 620</span><span class="comment">* (Returned) The dimension of linprm::piximg and linprm::imgpix (normally</span></div>
<div class="line"><a id="l00621" name="l00621"></a><span class="lineno"> 621</span><span class="comment">* equal to naxis).</span></div>
<div class="line"><a id="l00622" name="l00622"></a><span class="lineno"> 622</span><span class="comment">*</span></div>
<div class="line"><a id="l00623" name="l00623"></a><span class="lineno"> 623</span><span class="comment">* int unity</span></div>
<div class="line"><a id="l00624" name="l00624"></a><span class="lineno"> 624</span><span class="comment">* (Returned) True if the linear transformation matrix is unity.</span></div>
<div class="line"><a id="l00625" name="l00625"></a><span class="lineno"> 625</span><span class="comment">*</span></div>
<div class="line"><a id="l00626" name="l00626"></a><span class="lineno"> 626</span><span class="comment">* int affine</span></div>
<div class="line"><a id="l00627" name="l00627"></a><span class="lineno"> 627</span><span class="comment">* (Returned) True if there are no distortions.</span></div>
<div class="line"><a id="l00628" name="l00628"></a><span class="lineno"> 628</span><span class="comment">*</span></div>
<div class="line"><a id="l00629" name="l00629"></a><span class="lineno"> 629</span><span class="comment">* int simple</span></div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno"> 630</span><span class="comment">* (Returned) True if unity and no distortions.</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">* struct wcserr *err</span></div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno"> 633</span><span class="comment">* (Returned) If enabled, when an error status is returned, this struct</span></div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno"> 634</span><span class="comment">* contains detailed information about the error, see wcserr_enable().</span></div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno"> 635</span><span class="comment">*</span></div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno"> 636</span><span class="comment">* double *tmpcrd</span></div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno"> 637</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno"> 638</span><span class="comment">* int m_flag</span></div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno"> 639</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00640" name="l00640"></a><span class="lineno"> 640</span><span class="comment">* int m_naxis</span></div>
<div class="line"><a id="l00641" name="l00641"></a><span class="lineno"> 641</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00642" name="l00642"></a><span class="lineno"> 642</span><span class="comment">* double *m_crpix</span></div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno"> 643</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno"> 644</span><span class="comment">* double *m_pc</span></div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno"> 645</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno"> 646</span><span class="comment">* double *m_cdelt</span></div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno"> 647</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno"> 648</span><span class="comment">* struct disprm *m_dispre</span></div>
<div class="line"><a id="l00649" name="l00649"></a><span class="lineno"> 649</span><span class="comment">* (For internal use only.)</span></div>
<div class="line"><a id="l00650" name="l00650"></a><span class="lineno"> 650</span><span class="comment">* struct disprm *m_disseq</span></div>
<div class="line"><a id="l00651" name="l00651"></a><span class="lineno"> 651</span><span class="comment">* (For internal use only.)</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">*</span></div>
<div class="line"><a id="l00654" name="l00654"></a><span class="lineno"> 654</span><span class="comment">* Global variable: const char *lin_errmsg[] - Status return messages</span></div>
<div class="line"><a id="l00655" name="l00655"></a><span class="lineno"> 655</span><span class="comment">* ------------------------------------------------------------------</span></div>
<div class="line"><a id="l00656" name="l00656"></a><span class="lineno"> 656</span><span class="comment">* Error messages to match the status value returned from each function.</span></div>
<div class="line"><a id="l00657" name="l00657"></a><span class="lineno"> 657</span><span class="comment">*</span></div>
<div class="line"><a id="l00658" name="l00658"></a><span class="lineno"> 658</span><span class="comment">*===========================================================================*/</span></div>
<div class="line"><a id="l00659" name="l00659"></a><span class="lineno"> 659</span> </div>
<div class="line"><a id="l00660" name="l00660"></a><span class="lineno"> 660</span><span class="preprocessor">#ifndef WCSLIB_LIN</span></div>
<div class="line"><a id="l00661" name="l00661"></a><span class="lineno"> 661</span><span class="preprocessor">#define WCSLIB_LIN</span></div>
<div class="line"><a id="l00662" name="l00662"></a><span class="lineno"> 662</span> </div>
<div class="line"><a id="l00663" name="l00663"></a><span class="lineno"> 663</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l00664" name="l00664"></a><span class="lineno"> 664</span><span class="keyword">extern</span> <span class="stringliteral">"C"</span> {</div>
<div class="line"><a id="l00665" name="l00665"></a><span class="lineno"> 665</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00666" name="l00666"></a><span class="lineno"> 666</span> </div>
<div class="line"><a id="l00667" name="l00667"></a><span class="lineno"> 667</span> </div>
<div class="line"><a id="l00668" name="l00668"></a><span class="lineno"> 668</span><span class="keyword">extern</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code hl_variable" href="lin_8h.html#a7bdf034bd750df1e518db9feeebf7a79">lin_errmsg</a>[];</div>
<div class="line"><a id="l00669" name="l00669"></a><span class="lineno"> 669</span> </div>
<div class="foldopen" id="foldopen00670" data-start="{" data-end="};">
<div class="line"><a id="l00670" name="l00670"></a><span class="lineno"><a class="line" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1f"> 670</a></span><span class="keyword">enum</span> <a class="code hl_enumeration" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1f">lin_errmsg_enum</a> {</div>
<div class="line"><a id="l00671" name="l00671"></a><span class="lineno"><a class="line" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa2544660be2086b8225623e8a7b534dfb"> 671</a></span> <a class="code hl_enumvalue" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa2544660be2086b8225623e8a7b534dfb">LINERR_SUCCESS</a> = 0, <span class="comment">// Success.</span></div>
<div class="line"><a id="l00672" name="l00672"></a><span class="lineno"><a class="line" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa84e4dcf5e518ba3dce985ef7c9687513"> 672</a></span> <a class="code hl_enumvalue" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa84e4dcf5e518ba3dce985ef7c9687513">LINERR_NULL_POINTER</a> = 1, <span class="comment">// Null linprm pointer passed.</span></div>
<div class="line"><a id="l00673" name="l00673"></a><span class="lineno"><a class="line" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa28004da63d882a7df754d49047ea7f2d"> 673</a></span> <a class="code hl_enumvalue" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa28004da63d882a7df754d49047ea7f2d">LINERR_MEMORY</a> = 2, <span class="comment">// Memory allocation failed.</span></div>
<div class="line"><a id="l00674" name="l00674"></a><span class="lineno"><a class="line" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fad2248fa36c9d85c91187179ae95207e8"> 674</a></span> <a class="code hl_enumvalue" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fad2248fa36c9d85c91187179ae95207e8">LINERR_SINGULAR_MTX</a> = 3, <span class="comment">// PCi_ja matrix is singular.</span></div>
<div class="line"><a id="l00675" name="l00675"></a><span class="lineno"><a class="line" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fabf345caedf5c1dd97c44f38b34ca2da7"> 675</a></span> <a class="code hl_enumvalue" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fabf345caedf5c1dd97c44f38b34ca2da7">LINERR_DISTORT_INIT</a> = 4, <span class="comment">// Failed to initialise distortions.</span></div>
<div class="line"><a id="l00676" name="l00676"></a><span class="lineno"><a class="line" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa3e2bbcacb84e47b393daa1ff8c3e70a2"> 676</a></span> <a class="code hl_enumvalue" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa3e2bbcacb84e47b393daa1ff8c3e70a2">LINERR_DISTORT</a> = 5, <span class="comment">// Distort error.</span></div>
<div class="line"><a id="l00677" name="l00677"></a><span class="lineno"> 677</span> <a class="code hl_enumvalue" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa36fc93e3c5e2d1a1de01d399232a03d9">LINERR_DEDISTORT</a> = 6 <span class="comment">// De-distort error.</span></div>
<div class="line"><a id="l00678" name="l00678"></a><span class="lineno"><a class="line" href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa36fc93e3c5e2d1a1de01d399232a03d9"> 678</a></span>};</div>
</div>
<div class="line"><a id="l00679" name="l00679"></a><span class="lineno"> 679</span> </div>
<div class="foldopen" id="foldopen00680" data-start="{" data-end="};">
<div class="line"><a id="l00680" name="l00680"></a><span class="lineno"><a class="line" href="structlinprm.html"> 680</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structlinprm.html">linprm</a> {</div>
<div class="line"><a id="l00681" name="l00681"></a><span class="lineno"> 681</span> <span class="comment">// Initialization flag (see the prologue above).</span></div>
<div class="line"><a id="l00682" name="l00682"></a><span class="lineno"> 682</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00683" name="l00683"></a><span class="lineno"><a class="line" href="structlinprm.html#a5bb0b2b2ce1f160a8a70f6437a893eea"> 683</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structlinprm.html#a5bb0b2b2ce1f160a8a70f6437a893eea">flag</a>; <span class="comment">// Set to zero to force initialization.</span></div>
<div class="line"><a id="l00684" name="l00684"></a><span class="lineno"> 684</span> </div>
<div class="line"><a id="l00685" name="l00685"></a><span class="lineno"> 685</span> <span class="comment">// Parameters to be provided (see the prologue above).</span></div>
<div class="line"><a id="l00686" name="l00686"></a><span class="lineno"> 686</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00687" name="l00687"></a><span class="lineno"><a class="line" href="structlinprm.html#ae281f0f7ebeaf5038cc13c13946641b1"> 687</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structlinprm.html#ae281f0f7ebeaf5038cc13c13946641b1">naxis</a>; <span class="comment">// The number of axes, given by NAXIS.</span></div>
<div class="line"><a id="l00688" name="l00688"></a><span class="lineno"><a class="line" href="structlinprm.html#a3691ff3f40a0ba087637d30ffc87e6d0"> 688</a></span> <span class="keywordtype">double</span> *<a class="code hl_variable" href="structlinprm.html#a3691ff3f40a0ba087637d30ffc87e6d0">crpix</a>; <span class="comment">// CRPIXja keywords for each pixel axis.</span></div>
<div class="line"><a id="l00689" name="l00689"></a><span class="lineno"><a class="line" href="structlinprm.html#a4c40bec32ec40035b8c1ef13db652270"> 689</a></span> <span class="keywordtype">double</span> *<a class="code hl_variable" href="structlinprm.html#a4c40bec32ec40035b8c1ef13db652270">pc</a>; <span class="comment">// PCi_ja linear transformation matrix.</span></div>
<div class="line"><a id="l00690" name="l00690"></a><span class="lineno"><a class="line" href="structlinprm.html#a162762d02eaade6a53d63d70b8827caa"> 690</a></span> <span class="keywordtype">double</span> *<a class="code hl_variable" href="structlinprm.html#a162762d02eaade6a53d63d70b8827caa">cdelt</a>; <span class="comment">// CDELTia keywords for each coord axis.</span></div>
<div class="line"><a id="l00691" name="l00691"></a><span class="lineno"><a class="line" href="structlinprm.html#a7d951475b1c16f94703fba9e04ec24d2"> 691</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structdisprm.html">disprm</a> *<a class="code hl_variable" href="structlinprm.html#a7d951475b1c16f94703fba9e04ec24d2">dispre</a>; <span class="comment">// Prior distortion parameters, if any.</span></div>
<div class="line"><a id="l00692" name="l00692"></a><span class="lineno"><a class="line" href="structlinprm.html#a2c21e35f61f428ed14ca2b60bccc10c8"> 692</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structdisprm.html">disprm</a> *<a class="code hl_variable" href="structlinprm.html#a2c21e35f61f428ed14ca2b60bccc10c8">disseq</a>; <span class="comment">// Sequent distortion parameters, if any.</span></div>
<div class="line"><a id="l00693" name="l00693"></a><span class="lineno"> 693</span> </div>
<div class="line"><a id="l00694" name="l00694"></a><span class="lineno"> 694</span> <span class="comment">// Information derived from the parameters supplied.</span></div>
<div class="line"><a id="l00695" name="l00695"></a><span class="lineno"> 695</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00696" name="l00696"></a><span class="lineno"><a class="line" href="structlinprm.html#aeaaf26fd243da58fee173b075bed1de7"> 696</a></span> <span class="keywordtype">double</span> *<a class="code hl_variable" href="structlinprm.html#aeaaf26fd243da58fee173b075bed1de7">piximg</a>; <span class="comment">// Product of CDELTia and PCi_ja matrices.</span></div>
<div class="line"><a id="l00697" name="l00697"></a><span class="lineno"><a class="line" href="structlinprm.html#a28a705f744a32cd05dd3aa86ca58998b"> 697</a></span> <span class="keywordtype">double</span> *<a class="code hl_variable" href="structlinprm.html#a28a705f744a32cd05dd3aa86ca58998b">imgpix</a>; <span class="comment">// Inverse of the piximg matrix.</span></div>
<div class="line"><a id="l00698" name="l00698"></a><span class="lineno"><a class="line" href="structlinprm.html#a596f68ff17fce142f36530d72dd838c4"> 698</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structlinprm.html#a596f68ff17fce142f36530d72dd838c4">i_naxis</a>; <span class="comment">// Dimension of piximg and imgpix.</span></div>
<div class="line"><a id="l00699" name="l00699"></a><span class="lineno"><a class="line" href="structlinprm.html#af0a5cac7b1d2d3a0feb6905c05b122c2"> 699</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structlinprm.html#af0a5cac7b1d2d3a0feb6905c05b122c2">unity</a>; <span class="comment">// True if the PCi_ja matrix is unity.</span></div>
<div class="line"><a id="l00700" name="l00700"></a><span class="lineno"><a class="line" href="structlinprm.html#a499a66528c3dcb9d1a9bea67b5afaa0d"> 700</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structlinprm.html#a499a66528c3dcb9d1a9bea67b5afaa0d">affine</a>; <span class="comment">// True if there are no distortions.</span></div>
<div class="line"><a id="l00701" name="l00701"></a><span class="lineno"><a class="line" href="structlinprm.html#af3a8524b6c3c11315e4048d4bd6864c8"> 701</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structlinprm.html#af3a8524b6c3c11315e4048d4bd6864c8">simple</a>; <span class="comment">// True if unity and no distortions.</span></div>
<div class="line"><a id="l00702" name="l00702"></a><span class="lineno"> 702</span> </div>
<div class="line"><a id="l00703" name="l00703"></a><span class="lineno"> 703</span> <span class="comment">// Error handling, if enabled.</span></div>
<div class="line"><a id="l00704" name="l00704"></a><span class="lineno"> 704</span> <span class="comment">//--------------------------------------------------------------------------</span></div>
<div class="line"><a id="l00705" name="l00705"></a><span class="lineno"><a class="line" href="structlinprm.html#a2975830d4214bb6b35cb1ca922875057"> 705</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structwcserr.html">wcserr</a> *<a class="code hl_variable" href="structlinprm.html#a2975830d4214bb6b35cb1ca922875057">err</a>;</div>
<div class="line"><a id="l00706" name="l00706"></a><span class="lineno"> 706</span> </div>
<div class="line"><a id="l00707" name="l00707"></a><span class="lineno"> 707</span> <span class="comment">// Private - the remainder are for internal use.</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"><a class="line" href="structlinprm.html#adf299a3f7750599a48373ce370fde9da"> 709</a></span> <span class="keywordtype">double</span> *<a class="code hl_variable" href="structlinprm.html#adf299a3f7750599a48373ce370fde9da">tmpcrd</a>;</div>
<div class="line"><a id="l00710" name="l00710"></a><span class="lineno"> 710</span> </div>
<div class="line"><a id="l00711" name="l00711"></a><span class="lineno"><a class="line" href="structlinprm.html#a5ef7cce6307f640aca1080d0d5ad9ba1"> 711</a></span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structlinprm.html#a5ef7cce6307f640aca1080d0d5ad9ba1">m_flag</a>, <a class="code hl_variable" href="structlinprm.html#aeefcacedf2989970f0df2c246d84bfb7">m_naxis</a>;</div>
<div class="line"><a id="l00712" name="l00712"></a><span class="lineno"><a class="line" href="structlinprm.html#a5ac85757a7a46247e353a089374eb128"> 712</a></span> <span class="keywordtype">double</span> *<a class="code hl_variable" href="structlinprm.html#a091103ceb860eeed1a280effa0df28df">m_crpix</a>, *<a class="code hl_variable" href="structlinprm.html#a7036b8527bc8b220ad8a863442631f48">m_pc</a>, *<a class="code hl_variable" href="structlinprm.html#a5ac85757a7a46247e353a089374eb128">m_cdelt</a>;</div>
<div class="line"><a id="l00713" name="l00713"></a><span class="lineno"><a class="line" href="structlinprm.html#a9c5dae1285df5adbc684bb650a84b74a"> 713</a></span> <span class="keyword">struct </span><a class="code hl_struct" href="structdisprm.html">disprm</a> *<a class="code hl_variable" href="structlinprm.html#a9c5dae1285df5adbc684bb650a84b74a">m_dispre</a>, *<a class="code hl_variable" href="structlinprm.html#a7ecd987ea3b41b7d0a1c4489e882c1f4">m_disseq</a>;</div>
<div class="line"><a id="l00714" name="l00714"></a><span class="lineno"> 714</span>};</div>
</div>
<div class="line"><a id="l00715" name="l00715"></a><span class="lineno"> 715</span> </div>
<div class="line"><a id="l00716" name="l00716"></a><span class="lineno"> 716</span><span class="comment">// Size of the linprm struct in int units, used by the Fortran wrappers.</span></div>
<div class="line"><a id="l00717" name="l00717"></a><span class="lineno"><a class="line" href="lin_8h.html#afce62bec193631f6e6b58c5b786cd660"> 717</a></span><span class="preprocessor">#define LINLEN (sizeof(struct linprm)/sizeof(int))</span></div>
<div class="line"><a id="l00718" name="l00718"></a><span class="lineno"> 718</span> </div>
<div class="line"><a id="l00719" name="l00719"></a><span class="lineno"> 719</span> </div>
<div class="line"><a id="l00720" name="l00720"></a><span class="lineno"><a class="line" href="lin_8h.html#a7ddea28768d99f01c6be1c71a4d8fe58"> 720</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#a7ddea28768d99f01c6be1c71a4d8fe58">linini</a>(<span class="keywordtype">int</span> alloc, <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#a201bc2948f326bbed9a0e1f818720ef9">naxis</a>, <span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin);</div>
<div class="line"><a id="l00721" name="l00721"></a><span class="lineno"> 721</span> </div>
<div class="line"><a id="l00722" name="l00722"></a><span class="lineno"><a class="line" href="lin_8h.html#afa85e4b255b144d2b806f51be0d36be2"> 722</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#afa85e4b255b144d2b806f51be0d36be2">lininit</a>(<span class="keywordtype">int</span> alloc, <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#a201bc2948f326bbed9a0e1f818720ef9">naxis</a>, <span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin, <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#a6307557409cf4679a176f16b7dc14b7f">ndpmax</a>);</div>
<div class="line"><a id="l00723" name="l00723"></a><span class="lineno"> 723</span> </div>
<div class="line"><a id="l00724" name="l00724"></a><span class="lineno"><a class="line" href="lin_8h.html#ad68df60cc9fa6f86e2c6e6943dc74cdb"> 724</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#ad68df60cc9fa6f86e2c6e6943dc74cdb">lindis</a>(<span class="keywordtype">int</span> sequence, <span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin, <span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis);</div>
<div class="line"><a id="l00725" name="l00725"></a><span class="lineno"> 725</span> </div>
<div class="line"><a id="l00726" name="l00726"></a><span class="lineno"><a class="line" href="lin_8h.html#ad5bc6ffb673b1c38105bdf2d8def5194"> 726</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#ad5bc6ffb673b1c38105bdf2d8def5194">lindist</a>(<span class="keywordtype">int</span> sequence, <span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin, <span class="keyword">struct</span> <a class="code hl_struct" href="structdisprm.html">disprm</a> *dis, <span class="keywordtype">int</span> <a class="code hl_variable" href="structdisprm.html#a6307557409cf4679a176f16b7dc14b7f">ndpmax</a>);</div>
<div class="line"><a id="l00727" name="l00727"></a><span class="lineno"> 727</span> </div>
<div class="line"><a id="l00728" name="l00728"></a><span class="lineno"><a class="line" href="lin_8h.html#ab8fc0ef6b34eb3327b13a00de78232b1"> 728</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#ab8fc0ef6b34eb3327b13a00de78232b1">lincpy</a>(<span class="keywordtype">int</span> alloc, <span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *linsrc, <span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lindst);</div>
<div class="line"><a id="l00729" name="l00729"></a><span class="lineno"> 729</span> </div>
<div class="line"><a id="l00730" name="l00730"></a><span class="lineno"><a class="line" href="lin_8h.html#aef9ead7c6ea6ab08f3ba3fc6a1c30303"> 730</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#aef9ead7c6ea6ab08f3ba3fc6a1c30303">linfree</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin);</div>
<div class="line"><a id="l00731" name="l00731"></a><span class="lineno"> 731</span> </div>
<div class="line"><a id="l00732" name="l00732"></a><span class="lineno"><a class="line" href="lin_8h.html#a4994e12620ea9bb1377dd16d5e31fb20"> 732</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#a4994e12620ea9bb1377dd16d5e31fb20">linsize</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin, <span class="keywordtype">int</span> sizes[2]);</div>
<div class="line"><a id="l00733" name="l00733"></a><span class="lineno"> 733</span> </div>
<div class="line"><a id="l00734" name="l00734"></a><span class="lineno"><a class="line" href="lin_8h.html#a946005b038f5c584691630b5d39369e3"> 734</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#a946005b038f5c584691630b5d39369e3">linprt</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin);</div>
<div class="line"><a id="l00735" name="l00735"></a><span class="lineno"> 735</span> </div>
<div class="line"><a id="l00736" name="l00736"></a><span class="lineno"><a class="line" href="lin_8h.html#a7bdde709fac889f1c386e9c8993d74f7"> 736</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#a7bdde709fac889f1c386e9c8993d74f7">linperr</a>(<span class="keyword">const</span> <span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin, <span class="keyword">const</span> <span class="keywordtype">char</span> *prefix);</div>
<div class="line"><a id="l00737" name="l00737"></a><span class="lineno"> 737</span> </div>
<div class="line"><a id="l00738" name="l00738"></a><span class="lineno"><a class="line" href="lin_8h.html#a5c01c0991c8d0c4437581a7c1453b09a"> 738</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#a5c01c0991c8d0c4437581a7c1453b09a">linset</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin);</div>
<div class="line"><a id="l00739" name="l00739"></a><span class="lineno"> 739</span> </div>
<div class="line"><a id="l00740" name="l00740"></a><span class="lineno"><a class="line" href="lin_8h.html#ae4947608476c198ad27759d1e562d655"> 740</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#ae4947608476c198ad27759d1e562d655">linp2x</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin, <span class="keywordtype">int</span> ncoord, <span class="keywordtype">int</span> nelem, <span class="keyword">const</span> <span class="keywordtype">double</span> pixcrd[],</div>
<div class="line"><a id="l00741" name="l00741"></a><span class="lineno"> 741</span> <span class="keywordtype">double</span> imgcrd[]);</div>
<div class="line"><a id="l00742" name="l00742"></a><span class="lineno"> 742</span> </div>
<div class="line"><a id="l00743" name="l00743"></a><span class="lineno"><a class="line" href="lin_8h.html#a5490027e9699680dfefe370c28691243"> 743</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#a5490027e9699680dfefe370c28691243">linx2p</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin, <span class="keywordtype">int</span> ncoord, <span class="keywordtype">int</span> nelem, <span class="keyword">const</span> <span class="keywordtype">double</span> imgcrd[],</div>
<div class="line"><a id="l00744" name="l00744"></a><span class="lineno"> 744</span> <span class="keywordtype">double</span> pixcrd[]);</div>
<div class="line"><a id="l00745" name="l00745"></a><span class="lineno"> 745</span> </div>
<div class="line"><a id="l00746" name="l00746"></a><span class="lineno"><a class="line" href="lin_8h.html#a27a7a4a2cc3183bb1cd639efaade2265"> 746</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#a27a7a4a2cc3183bb1cd639efaade2265">linwarp</a>(<span class="keyword">struct</span> <a class="code hl_struct" href="structlinprm.html">linprm</a> *lin, <span class="keyword">const</span> <span class="keywordtype">double</span> pixblc[], <span class="keyword">const</span> <span class="keywordtype">double</span> pixtrc[],</div>
<div class="line"><a id="l00747" name="l00747"></a><span class="lineno"> 747</span> <span class="keyword">const</span> <span class="keywordtype">double</span> pixsamp[], <span class="keywordtype">int</span> *nsamp,</div>
<div class="line"><a id="l00748" name="l00748"></a><span class="lineno"> 748</span> <span class="keywordtype">double</span> <a class="code hl_variable" href="structdisprm.html#ac107b9b4c645a461036476290a87ab22">maxdis</a>[], <span class="keywordtype">double</span> *maxtot,</div>
<div class="line"><a id="l00749" name="l00749"></a><span class="lineno"> 749</span> <span class="keywordtype">double</span> avgdis[], <span class="keywordtype">double</span> *avgtot,</div>
<div class="line"><a id="l00750" name="l00750"></a><span class="lineno"> 750</span> <span class="keywordtype">double</span> rmsdis[], <span class="keywordtype">double</span> *rmstot);</div>
<div class="line"><a id="l00751" name="l00751"></a><span class="lineno"> 751</span> </div>
<div class="line"><a id="l00752" name="l00752"></a><span class="lineno"><a class="line" href="lin_8h.html#acc7d26efba3ca08d36047253a9315dcc"> 752</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="lin_8h.html#acc7d26efba3ca08d36047253a9315dcc">matinv</a>(<span class="keywordtype">int</span> n, <span class="keyword">const</span> <span class="keywordtype">double</span> mat[], <span class="keywordtype">double</span> inv[]);</div>
<div class="line"><a id="l00753" name="l00753"></a><span class="lineno"> 753</span> </div>
<div class="line"><a id="l00754" name="l00754"></a><span class="lineno"> 754</span> </div>
<div class="line"><a id="l00755" name="l00755"></a><span class="lineno"> 755</span><span class="comment">// Deprecated.</span></div>
<div class="line"><a id="l00756" name="l00756"></a><span class="lineno"><a class="line" href="lin_8h.html#affec8a2c0650ebd2168d7772b2ecec19"> 756</a></span><span class="preprocessor">#define linini_errmsg lin_errmsg</span></div>
<div class="line"><a id="l00757" name="l00757"></a><span class="lineno"><a class="line" href="lin_8h.html#a58c2822debf5b36daa18fe8711d724f2"> 757</a></span><span class="preprocessor">#define lincpy_errmsg lin_errmsg</span></div>
<div class="line"><a id="l00758" name="l00758"></a><span class="lineno"><a class="line" href="lin_8h.html#aa6d3f59059c532b0217f570f2b4f50df"> 758</a></span><span class="preprocessor">#define linfree_errmsg lin_errmsg</span></div>
<div class="line"><a id="l00759" name="l00759"></a><span class="lineno"><a class="line" href="lin_8h.html#a8970e09d61fde987211f8e64061e1fa1"> 759</a></span><span class="preprocessor">#define linprt_errmsg lin_errmsg</span></div>
<div class="line"><a id="l00760" name="l00760"></a><span class="lineno"><a class="line" href="lin_8h.html#aa78f202b20674909aab523018106546e"> 760</a></span><span class="preprocessor">#define linset_errmsg lin_errmsg</span></div>
<div class="line"><a id="l00761" name="l00761"></a><span class="lineno"><a class="line" href="lin_8h.html#acb8c02645d7cc3d42e3db6ebf74de192"> 761</a></span><span class="preprocessor">#define linp2x_errmsg lin_errmsg</span></div>
<div class="line"><a id="l00762" name="l00762"></a><span class="lineno"><a class="line" href="lin_8h.html#a7232df93295216e063c438671652c2b4"> 762</a></span><span class="preprocessor">#define linx2p_errmsg lin_errmsg</span></div>
<div class="line"><a id="l00763" name="l00763"></a><span class="lineno"> 763</span> </div>
<div class="line"><a id="l00764" name="l00764"></a><span class="lineno"> 764</span><span class="preprocessor">#ifdef __cplusplus</span></div>
<div class="line"><a id="l00765" name="l00765"></a><span class="lineno"> 765</span>}</div>
<div class="line"><a id="l00766" name="l00766"></a><span class="lineno"> 766</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00767" name="l00767"></a><span class="lineno"> 767</span> </div>
<div class="line"><a id="l00768" name="l00768"></a><span class="lineno"> 768</span><span class="preprocessor">#endif </span><span class="comment">// WCSLIB_LIN</span></div>
<div class="ttc" id="alin_8h_html_a27a7a4a2cc3183bb1cd639efaade2265"><div class="ttname"><a href="lin_8h.html#a27a7a4a2cc3183bb1cd639efaade2265">linwarp</a></div><div class="ttdeci">int linwarp(struct linprm *lin, const double pixblc[], const double pixtrc[], const double pixsamp[], int *nsamp, double maxdis[], double *maxtot, double avgdis[], double *avgtot, double rmsdis[], double *rmstot)</div><div class="ttdoc">Compute measures of distortion.</div></div>
<div class="ttc" id="alin_8h_html_a4994e12620ea9bb1377dd16d5e31fb20"><div class="ttname"><a href="lin_8h.html#a4994e12620ea9bb1377dd16d5e31fb20">linsize</a></div><div class="ttdeci">int linsize(const struct linprm *lin, int sizes[2])</div><div class="ttdoc">Compute the size of a linprm struct.</div></div>
<div class="ttc" id="alin_8h_html_a5490027e9699680dfefe370c28691243"><div class="ttname"><a href="lin_8h.html#a5490027e9699680dfefe370c28691243">linx2p</a></div><div class="ttdeci">int linx2p(struct linprm *lin, int ncoord, int nelem, const double imgcrd[], double pixcrd[])</div><div class="ttdoc">World-to-pixel linear transformation.</div></div>
<div class="ttc" id="alin_8h_html_a5c01c0991c8d0c4437581a7c1453b09a"><div class="ttname"><a href="lin_8h.html#a5c01c0991c8d0c4437581a7c1453b09a">linset</a></div><div class="ttdeci">int linset(struct linprm *lin)</div><div class="ttdoc">Setup routine for the linprm struct.</div></div>
<div class="ttc" id="alin_8h_html_a6690044d47c6784a4cc0ccf6f52bfc1f"><div class="ttname"><a href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1f">lin_errmsg_enum</a></div><div class="ttdeci">lin_errmsg_enum</div><div class="ttdef"><b>Definition</b> lin.h:670</div></div>
<div class="ttc" id="alin_8h_html_a6690044d47c6784a4cc0ccf6f52bfc1fa2544660be2086b8225623e8a7b534dfb"><div class="ttname"><a href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa2544660be2086b8225623e8a7b534dfb">LINERR_SUCCESS</a></div><div class="ttdeci">@ LINERR_SUCCESS</div><div class="ttdef"><b>Definition</b> lin.h:671</div></div>
<div class="ttc" id="alin_8h_html_a6690044d47c6784a4cc0ccf6f52bfc1fa28004da63d882a7df754d49047ea7f2d"><div class="ttname"><a href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa28004da63d882a7df754d49047ea7f2d">LINERR_MEMORY</a></div><div class="ttdeci">@ LINERR_MEMORY</div><div class="ttdef"><b>Definition</b> lin.h:673</div></div>
<div class="ttc" id="alin_8h_html_a6690044d47c6784a4cc0ccf6f52bfc1fa36fc93e3c5e2d1a1de01d399232a03d9"><div class="ttname"><a href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa36fc93e3c5e2d1a1de01d399232a03d9">LINERR_DEDISTORT</a></div><div class="ttdeci">@ LINERR_DEDISTORT</div><div class="ttdef"><b>Definition</b> lin.h:677</div></div>
<div class="ttc" id="alin_8h_html_a6690044d47c6784a4cc0ccf6f52bfc1fa3e2bbcacb84e47b393daa1ff8c3e70a2"><div class="ttname"><a href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa3e2bbcacb84e47b393daa1ff8c3e70a2">LINERR_DISTORT</a></div><div class="ttdeci">@ LINERR_DISTORT</div><div class="ttdef"><b>Definition</b> lin.h:676</div></div>
<div class="ttc" id="alin_8h_html_a6690044d47c6784a4cc0ccf6f52bfc1fa84e4dcf5e518ba3dce985ef7c9687513"><div class="ttname"><a href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fa84e4dcf5e518ba3dce985ef7c9687513">LINERR_NULL_POINTER</a></div><div class="ttdeci">@ LINERR_NULL_POINTER</div><div class="ttdef"><b>Definition</b> lin.h:672</div></div>
<div class="ttc" id="alin_8h_html_a6690044d47c6784a4cc0ccf6f52bfc1fabf345caedf5c1dd97c44f38b34ca2da7"><div class="ttname"><a href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fabf345caedf5c1dd97c44f38b34ca2da7">LINERR_DISTORT_INIT</a></div><div class="ttdeci">@ LINERR_DISTORT_INIT</div><div class="ttdef"><b>Definition</b> lin.h:675</div></div>
<div class="ttc" id="alin_8h_html_a6690044d47c6784a4cc0ccf6f52bfc1fad2248fa36c9d85c91187179ae95207e8"><div class="ttname"><a href="lin_8h.html#a6690044d47c6784a4cc0ccf6f52bfc1fad2248fa36c9d85c91187179ae95207e8">LINERR_SINGULAR_MTX</a></div><div class="ttdeci">@ LINERR_SINGULAR_MTX</div><div class="ttdef"><b>Definition</b> lin.h:674</div></div>
<div class="ttc" id="alin_8h_html_a7bdde709fac889f1c386e9c8993d74f7"><div class="ttname"><a href="lin_8h.html#a7bdde709fac889f1c386e9c8993d74f7">linperr</a></div><div class="ttdeci">int linperr(const struct linprm *lin, const char *prefix)</div><div class="ttdoc">Print error messages from a linprm struct.</div></div>
<div class="ttc" id="alin_8h_html_a7bdf034bd750df1e518db9feeebf7a79"><div class="ttname"><a href="lin_8h.html#a7bdf034bd750df1e518db9feeebf7a79">lin_errmsg</a></div><div class="ttdeci">const char * lin_errmsg[]</div><div class="ttdoc">Status return messages.</div></div>
<div class="ttc" id="alin_8h_html_a7ddea28768d99f01c6be1c71a4d8fe58"><div class="ttname"><a href="lin_8h.html#a7ddea28768d99f01c6be1c71a4d8fe58">linini</a></div><div class="ttdeci">int linini(int alloc, int naxis, struct linprm *lin)</div><div class="ttdoc">Default constructor for the linprm struct.</div></div>
<div class="ttc" id="alin_8h_html_a946005b038f5c584691630b5d39369e3"><div class="ttname"><a href="lin_8h.html#a946005b038f5c584691630b5d39369e3">linprt</a></div><div class="ttdeci">int linprt(const struct linprm *lin)</div><div class="ttdoc">Print routine for the linprm struct.</div></div>
<div class="ttc" id="alin_8h_html_ab8fc0ef6b34eb3327b13a00de78232b1"><div class="ttname"><a href="lin_8h.html#ab8fc0ef6b34eb3327b13a00de78232b1">lincpy</a></div><div class="ttdeci">int lincpy(int alloc, const struct linprm *linsrc, struct linprm *lindst)</div><div class="ttdoc">Copy routine for the linprm struct.</div></div>
<div class="ttc" id="alin_8h_html_acc7d26efba3ca08d36047253a9315dcc"><div class="ttname"><a href="lin_8h.html#acc7d26efba3ca08d36047253a9315dcc">matinv</a></div><div class="ttdeci">int matinv(int n, const double mat[], double inv[])</div><div class="ttdoc">Matrix inversion.</div></div>
<div class="ttc" id="alin_8h_html_ad5bc6ffb673b1c38105bdf2d8def5194"><div class="ttname"><a href="lin_8h.html#ad5bc6ffb673b1c38105bdf2d8def5194">lindist</a></div><div class="ttdeci">int lindist(int sequence, struct linprm *lin, struct disprm *dis, int ndpmax)</div><div class="ttdoc">Assign a distortion to a linprm struct.</div></div>
<div class="ttc" id="alin_8h_html_ad68df60cc9fa6f86e2c6e6943dc74cdb"><div class="ttname"><a href="lin_8h.html#ad68df60cc9fa6f86e2c6e6943dc74cdb">lindis</a></div><div class="ttdeci">int lindis(int sequence, struct linprm *lin, struct disprm *dis)</div><div class="ttdoc">Assign a distortion to a linprm struct.</div></div>
<div class="ttc" id="alin_8h_html_ae4947608476c198ad27759d1e562d655"><div class="ttname"><a href="lin_8h.html#ae4947608476c198ad27759d1e562d655">linp2x</a></div><div class="ttdeci">int linp2x(struct linprm *lin, int ncoord, int nelem, const double pixcrd[], double imgcrd[])</div><div class="ttdoc">Pixel-to-world linear transformation.</div></div>
<div class="ttc" id="alin_8h_html_aef9ead7c6ea6ab08f3ba3fc6a1c30303"><div class="ttname"><a href="lin_8h.html#aef9ead7c6ea6ab08f3ba3fc6a1c30303">linfree</a></div><div class="ttdeci">int linfree(struct linprm *lin)</div><div class="ttdoc">Destructor for the linprm struct.</div></div>
<div class="ttc" id="alin_8h_html_afa85e4b255b144d2b806f51be0d36be2"><div class="ttname"><a href="lin_8h.html#afa85e4b255b144d2b806f51be0d36be2">lininit</a></div><div class="ttdeci">int lininit(int alloc, int naxis, struct linprm *lin, int ndpmax)</div><div class="ttdoc">Default constructor for the linprm struct.</div></div>
<div class="ttc" id="astructdisprm_html"><div class="ttname"><a href="structdisprm.html">disprm</a></div><div class="ttdoc">Distortion parameters.</div><div class="ttdef"><b>Definition</b> dis.h:1093</div></div>
<div class="ttc" id="astructdisprm_html_a201bc2948f326bbed9a0e1f818720ef9"><div class="ttname"><a href="structdisprm.html#a201bc2948f326bbed9a0e1f818720ef9">disprm::naxis</a></div><div class="ttdeci">int naxis</div><div class="ttdef"><b>Definition</b> dis.h:1100</div></div>
<div class="ttc" id="astructdisprm_html_a6307557409cf4679a176f16b7dc14b7f"><div class="ttname"><a href="structdisprm.html#a6307557409cf4679a176f16b7dc14b7f">disprm::ndpmax</a></div><div class="ttdeci">int ndpmax</div><div class="ttdef"><b>Definition</b> dis.h:1104</div></div>
<div class="ttc" id="astructdisprm_html_ac107b9b4c645a461036476290a87ab22"><div class="ttname"><a href="structdisprm.html#ac107b9b4c645a461036476290a87ab22">disprm::maxdis</a></div><div class="ttdeci">double * maxdis</div><div class="ttdef"><b>Definition</b> dis.h:1107</div></div>
<div class="ttc" id="astructlinprm_html"><div class="ttname"><a href="structlinprm.html">linprm</a></div><div class="ttdoc">Linear transformation parameters.</div><div class="ttdef"><b>Definition</b> lin.h:680</div></div>
<div class="ttc" id="astructlinprm_html_a091103ceb860eeed1a280effa0df28df"><div class="ttname"><a href="structlinprm.html#a091103ceb860eeed1a280effa0df28df">linprm::m_crpix</a></div><div class="ttdeci">double * m_crpix</div><div class="ttdef"><b>Definition</b> lin.h:712</div></div>
<div class="ttc" id="astructlinprm_html_a162762d02eaade6a53d63d70b8827caa"><div class="ttname"><a href="structlinprm.html#a162762d02eaade6a53d63d70b8827caa">linprm::cdelt</a></div><div class="ttdeci">double * cdelt</div><div class="ttdef"><b>Definition</b> lin.h:690</div></div>
<div class="ttc" id="astructlinprm_html_a28a705f744a32cd05dd3aa86ca58998b"><div class="ttname"><a href="structlinprm.html#a28a705f744a32cd05dd3aa86ca58998b">linprm::imgpix</a></div><div class="ttdeci">double * imgpix</div><div class="ttdef"><b>Definition</b> lin.h:697</div></div>
<div class="ttc" id="astructlinprm_html_a2975830d4214bb6b35cb1ca922875057"><div class="ttname"><a href="structlinprm.html#a2975830d4214bb6b35cb1ca922875057">linprm::err</a></div><div class="ttdeci">struct wcserr * err</div><div class="ttdef"><b>Definition</b> lin.h:705</div></div>
<div class="ttc" id="astructlinprm_html_a2c21e35f61f428ed14ca2b60bccc10c8"><div class="ttname"><a href="structlinprm.html#a2c21e35f61f428ed14ca2b60bccc10c8">linprm::disseq</a></div><div class="ttdeci">struct disprm * disseq</div><div class="ttdef"><b>Definition</b> lin.h:692</div></div>
<div class="ttc" id="astructlinprm_html_a3691ff3f40a0ba087637d30ffc87e6d0"><div class="ttname"><a href="structlinprm.html#a3691ff3f40a0ba087637d30ffc87e6d0">linprm::crpix</a></div><div class="ttdeci">double * crpix</div><div class="ttdef"><b>Definition</b> lin.h:688</div></div>
<div class="ttc" id="astructlinprm_html_a499a66528c3dcb9d1a9bea67b5afaa0d"><div class="ttname"><a href="structlinprm.html#a499a66528c3dcb9d1a9bea67b5afaa0d">linprm::affine</a></div><div class="ttdeci">int affine</div><div class="ttdef"><b>Definition</b> lin.h:700</div></div>
<div class="ttc" id="astructlinprm_html_a4c40bec32ec40035b8c1ef13db652270"><div class="ttname"><a href="structlinprm.html#a4c40bec32ec40035b8c1ef13db652270">linprm::pc</a></div><div class="ttdeci">double * pc</div><div class="ttdef"><b>Definition</b> lin.h:689</div></div>
<div class="ttc" id="astructlinprm_html_a596f68ff17fce142f36530d72dd838c4"><div class="ttname"><a href="structlinprm.html#a596f68ff17fce142f36530d72dd838c4">linprm::i_naxis</a></div><div class="ttdeci">int i_naxis</div><div class="ttdef"><b>Definition</b> lin.h:698</div></div>
<div class="ttc" id="astructlinprm_html_a5ac85757a7a46247e353a089374eb128"><div class="ttname"><a href="structlinprm.html#a5ac85757a7a46247e353a089374eb128">linprm::m_cdelt</a></div><div class="ttdeci">double * m_cdelt</div><div class="ttdef"><b>Definition</b> lin.h:712</div></div>
<div class="ttc" id="astructlinprm_html_a5bb0b2b2ce1f160a8a70f6437a893eea"><div class="ttname"><a href="structlinprm.html#a5bb0b2b2ce1f160a8a70f6437a893eea">linprm::flag</a></div><div class="ttdeci">int flag</div><div class="ttdef"><b>Definition</b> lin.h:683</div></div>
<div class="ttc" id="astructlinprm_html_a5ef7cce6307f640aca1080d0d5ad9ba1"><div class="ttname"><a href="structlinprm.html#a5ef7cce6307f640aca1080d0d5ad9ba1">linprm::m_flag</a></div><div class="ttdeci">int m_flag</div><div class="ttdef"><b>Definition</b> lin.h:711</div></div>
<div class="ttc" id="astructlinprm_html_a7036b8527bc8b220ad8a863442631f48"><div class="ttname"><a href="structlinprm.html#a7036b8527bc8b220ad8a863442631f48">linprm::m_pc</a></div><div class="ttdeci">double * m_pc</div><div class="ttdef"><b>Definition</b> lin.h:712</div></div>
<div class="ttc" id="astructlinprm_html_a7d951475b1c16f94703fba9e04ec24d2"><div class="ttname"><a href="structlinprm.html#a7d951475b1c16f94703fba9e04ec24d2">linprm::dispre</a></div><div class="ttdeci">struct disprm * dispre</div><div class="ttdef"><b>Definition</b> lin.h:691</div></div>
<div class="ttc" id="astructlinprm_html_a7ecd987ea3b41b7d0a1c4489e882c1f4"><div class="ttname"><a href="structlinprm.html#a7ecd987ea3b41b7d0a1c4489e882c1f4">linprm::m_disseq</a></div><div class="ttdeci">struct disprm * m_disseq</div><div class="ttdef"><b>Definition</b> lin.h:713</div></div>
<div class="ttc" id="astructlinprm_html_a9c5dae1285df5adbc684bb650a84b74a"><div class="ttname"><a href="structlinprm.html#a9c5dae1285df5adbc684bb650a84b74a">linprm::m_dispre</a></div><div class="ttdeci">struct disprm * m_dispre</div><div class="ttdef"><b>Definition</b> lin.h:713</div></div>
<div class="ttc" id="astructlinprm_html_adf299a3f7750599a48373ce370fde9da"><div class="ttname"><a href="structlinprm.html#adf299a3f7750599a48373ce370fde9da">linprm::tmpcrd</a></div><div class="ttdeci">double * tmpcrd</div><div class="ttdef"><b>Definition</b> lin.h:709</div></div>
<div class="ttc" id="astructlinprm_html_ae281f0f7ebeaf5038cc13c13946641b1"><div class="ttname"><a href="structlinprm.html#ae281f0f7ebeaf5038cc13c13946641b1">linprm::naxis</a></div><div class="ttdeci">int naxis</div><div class="ttdef"><b>Definition</b> lin.h:687</div></div>
<div class="ttc" id="astructlinprm_html_aeaaf26fd243da58fee173b075bed1de7"><div class="ttname"><a href="structlinprm.html#aeaaf26fd243da58fee173b075bed1de7">linprm::piximg</a></div><div class="ttdeci">double * piximg</div><div class="ttdef"><b>Definition</b> lin.h:696</div></div>
<div class="ttc" id="astructlinprm_html_aeefcacedf2989970f0df2c246d84bfb7"><div class="ttname"><a href="structlinprm.html#aeefcacedf2989970f0df2c246d84bfb7">linprm::m_naxis</a></div><div class="ttdeci">int m_naxis</div><div class="ttdef"><b>Definition</b> lin.h:711</div></div>
<div class="ttc" id="astructlinprm_html_af0a5cac7b1d2d3a0feb6905c05b122c2"><div class="ttname"><a href="structlinprm.html#af0a5cac7b1d2d3a0feb6905c05b122c2">linprm::unity</a></div><div class="ttdeci">int unity</div><div class="ttdef"><b>Definition</b> lin.h:699</div></div>
<div class="ttc" id="astructlinprm_html_af3a8524b6c3c11315e4048d4bd6864c8"><div class="ttname"><a href="structlinprm.html#af3a8524b6c3c11315e4048d4bd6864c8">linprm::simple</a></div><div class="ttdeci">int simple</div><div class="ttdef"><b>Definition</b> lin.h:701</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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