wcslib (8.2.2)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=11"/>
<meta name="generator" content="Doxygen 1.9.8"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>WCSLIB: wcsmath.h File Reference</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/searchdata.js"></script>
<script type="text/javascript" src="search/search.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr id="projectrow">
<td id="projectalign">
<div id="projectname">WCSLIB<span id="projectnumber"> 8.2.2</span>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.9.8 -->
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */
var searchBox = new SearchBox("searchBox", "search/",'.html');
/* @license-end */
</script>
<script type="text/javascript" src="menudata.js"></script>
<script type="text/javascript" src="menu.js"></script>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */
$(function() {
initMenu('',true,false,'search.php','Search');
$(document).ready(function() { init_search(); });
});
/* @license-end */
</script>
<div id="main-nav"></div>
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
</div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<div id="MSearchResults">
<div class="SRPage">
<div id="SRIndex">
<div id="SRResults"></div>
<div class="SRStatus" id="Loading">Loading...</div>
<div class="SRStatus" id="Searching">Searching...</div>
<div class="SRStatus" id="NoMatches">No Matches</div>
</div>
</div>
</div>
</div>
<div id="nav-path" class="navpath">
<ul>
<li class="navelem"><a class="el" href="dir_af99bb3c152a306abd27951285ad1127.html">C</a></li> </ul>
</div>
</div><!-- top -->
<div class="header">
<div class="summary">
<a href="#define-members">Macros</a> </div>
<div class="headertitle"><div class="title">wcsmath.h File Reference</div></div>
</div><!--header-->
<div class="contents">
<p><a href="wcsmath_8h_source.html">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="define-members" name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:a598a3330b3c21701223ee0ca14316eca" id="r_a598a3330b3c21701223ee0ca14316eca"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#a598a3330b3c21701223ee0ca14316eca">PI</a>   3.141592653589793238462643</td></tr>
<tr class="separator:a598a3330b3c21701223ee0ca14316eca"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a0a3cc1d5cde549e408f825ddd7f5853d" id="r_a0a3cc1d5cde549e408f825ddd7f5853d"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#a0a3cc1d5cde549e408f825ddd7f5853d">D2R</a>   <a class="el" href="wcsmath_8h.html#a598a3330b3c21701223ee0ca14316eca">PI</a>/180.0</td></tr>
<tr class="memdesc:a0a3cc1d5cde549e408f825ddd7f5853d"><td class="mdescLeft"> </td><td class="mdescRight">Degrees to radians conversion factor. <br /></td></tr>
<tr class="separator:a0a3cc1d5cde549e408f825ddd7f5853d"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a39c663074332446065723e9be9350139" id="r_a39c663074332446065723e9be9350139"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#a39c663074332446065723e9be9350139">R2D</a>   180.0/<a class="el" href="wcsmath_8h.html#a598a3330b3c21701223ee0ca14316eca">PI</a></td></tr>
<tr class="memdesc:a39c663074332446065723e9be9350139"><td class="mdescLeft"> </td><td class="mdescRight">Radians to degrees conversion factor. <br /></td></tr>
<tr class="separator:a39c663074332446065723e9be9350139"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a514396dd60fa0621c83072091fb2a0cd" id="r_a514396dd60fa0621c83072091fb2a0cd"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#a514396dd60fa0621c83072091fb2a0cd">SQRT2</a>   1.4142135623730950488</td></tr>
<tr class="separator:a514396dd60fa0621c83072091fb2a0cd"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a01d44d9782a85952a48ed76bf105351b" id="r_a01d44d9782a85952a48ed76bf105351b"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#a01d44d9782a85952a48ed76bf105351b">SQRT2INV</a>   1.0/<a class="el" href="wcsmath_8h.html#a514396dd60fa0621c83072091fb2a0cd">SQRT2</a></td></tr>
<tr class="separator:a01d44d9782a85952a48ed76bf105351b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:a2dc3870be25a19efa2940150507aaf71" id="r_a2dc3870be25a19efa2940150507aaf71"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#a2dc3870be25a19efa2940150507aaf71">UNDEFINED</a>   987654321.0e99</td></tr>
<tr class="memdesc:a2dc3870be25a19efa2940150507aaf71"><td class="mdescLeft"> </td><td class="mdescRight">Value used to indicate an undefined quantity. <br /></td></tr>
<tr class="separator:a2dc3870be25a19efa2940150507aaf71"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:adea646bef24ac88b544d7094860127ff" id="r_adea646bef24ac88b544d7094860127ff"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#adea646bef24ac88b544d7094860127ff">undefined</a>(value)   (value == <a class="el" href="wcsmath_8h.html#a2dc3870be25a19efa2940150507aaf71">UNDEFINED</a>)</td></tr>
<tr class="memdesc:adea646bef24ac88b544d7094860127ff"><td class="mdescLeft"> </td><td class="mdescRight">Macro used to test for an undefined quantity. <br /></td></tr>
<tr class="separator:adea646bef24ac88b544d7094860127ff"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Definition of mathematical constants used by WCSLIB. </p>
</div><h2 class="groupheader">Macro Definition Documentation</h2>
<a id="a598a3330b3c21701223ee0ca14316eca" name="a598a3330b3c21701223ee0ca14316eca"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a598a3330b3c21701223ee0ca14316eca">◆ </a></span>PI</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define PI   3.141592653589793238462643</td>
</tr>
</table>
</div><div class="memdoc">
</div>
</div>
<a id="a0a3cc1d5cde549e408f825ddd7f5853d" name="a0a3cc1d5cde549e408f825ddd7f5853d"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a0a3cc1d5cde549e408f825ddd7f5853d">◆ </a></span>D2R</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define D2R   <a class="el" href="wcsmath_8h.html#a598a3330b3c21701223ee0ca14316eca">PI</a>/180.0</td>
</tr>
</table>
</div><div class="memdoc">
<p>Degrees to radians conversion factor. </p>
<p>Factor <picture><source srcset="form_67_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$\pi/180^\circ$" src="form_67.png" width="39" height="14"/></picture> to convert from degrees to radians. </p>
</div>
</div>
<a id="a39c663074332446065723e9be9350139" name="a39c663074332446065723e9be9350139"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a39c663074332446065723e9be9350139">◆ </a></span>R2D</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define R2D   180.0/<a class="el" href="wcsmath_8h.html#a598a3330b3c21701223ee0ca14316eca">PI</a></td>
</tr>
</table>
</div><div class="memdoc">
<p>Radians to degrees conversion factor. </p>
<p>Factor <picture><source srcset="form_31_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$180^\circ/\pi$" src="form_31.png" width="38" height="14"/></picture> to convert from radians to degrees. </p>
</div>
</div>
<a id="a514396dd60fa0621c83072091fb2a0cd" name="a514396dd60fa0621c83072091fb2a0cd"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a514396dd60fa0621c83072091fb2a0cd">◆ </a></span>SQRT2</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define SQRT2   1.4142135623730950488</td>
</tr>
</table>
</div><div class="memdoc">
<p><picture><source srcset="form_68_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$\sqrt{2}$" src="form_68.png" width="16" height="14"/></picture>, used only by <a class="el" href="prj_8h.html#a151140d870ed4f490317938bd6260a6a" title="Set up a prjprm struct for Mollweide's (MOL) projection.">molset()</a> (<b><code>MOL</code></b> projection). </p>
</div>
</div>
<a id="a01d44d9782a85952a48ed76bf105351b" name="a01d44d9782a85952a48ed76bf105351b"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a01d44d9782a85952a48ed76bf105351b">◆ </a></span>SQRT2INV</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define SQRT2INV   1.0/<a class="el" href="wcsmath_8h.html#a514396dd60fa0621c83072091fb2a0cd">SQRT2</a></td>
</tr>
</table>
</div><div class="memdoc">
<p><picture><source srcset="form_69_dark.png" media="(prefers-color-scheme: dark)"/><img class="formulaInl" alt="$1/\sqrt{2}$" src="form_69.png" width="29" height="15"/></picture>, used only by <a class="el" href="prj_8h.html#afc5276e759c799deea36271d9cafc5e9" title="Cartesian-to-spherical transformation for the quadrilateralized spherical cube (QSC) projection.">qscx2s()</a> (<b><code>QSC</code></b> projection). </p>
</div>
</div>
<a id="a2dc3870be25a19efa2940150507aaf71" name="a2dc3870be25a19efa2940150507aaf71"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2dc3870be25a19efa2940150507aaf71">◆ </a></span>UNDEFINED</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define UNDEFINED   987654321.0e99</td>
</tr>
</table>
</div><div class="memdoc">
<p>Value used to indicate an undefined quantity. </p>
<p>Value used to indicate an undefined quantity (noting that NaNs cannot be used portably). </p>
</div>
</div>
<a id="adea646bef24ac88b544d7094860127ff" name="adea646bef24ac88b544d7094860127ff"></a>
<h2 class="memtitle"><span class="permalink"><a href="#adea646bef24ac88b544d7094860127ff">◆ </a></span>undefined</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define undefined</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">value</td><td>)</td>
<td>   (value == <a class="el" href="wcsmath_8h.html#a2dc3870be25a19efa2940150507aaf71">UNDEFINED</a>)</td>
</tr>
</table>
</div><div class="memdoc">
<p>Macro used to test for an undefined quantity. </p>
<p>Macro used to test for an undefined value. </p>
</div>
</div>
</div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated on Wed Nov 29 2023 19:09:57 for WCSLIB by <a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.9.8
</small></address>
</body>
</html>
Browse
Usage
Versions