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Macros</h2></td></tr>
<tr class="memitem: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>
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<tr class="memitem: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. <a href="#a0a3cc1d5cde549e408f825ddd7f5853d">More...</a><br/></td></tr>
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<tr class="memitem: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. <a href="#a39c663074332446065723e9be9350139">More...</a><br/></td></tr>
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<tr class="memitem: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>
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<tr class="memitem: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>
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<tr class="memitem: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. <a href="#a2dc3870be25a19efa2940150507aaf71">More...</a><br/></td></tr>
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<tr class="memitem: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. <a href="#adea646bef24ac88b544d7094860127ff">More...</a><br/></td></tr>
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<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>
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<td class="memname">#define PI   3.141592653589793238462643</td>
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<td class="memname">#define D2R   <a class="el" href="wcsmath_8h.html#a598a3330b3c21701223ee0ca14316eca">PI</a>/180.0</td>
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<p>Factor <img class="formulaInl" alt="$\pi/180^\circ$" src="form_65.png"/> to convert from degrees to radians. </p>
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<td class="memname">#define R2D   180.0/<a class="el" href="wcsmath_8h.html#a598a3330b3c21701223ee0ca14316eca">PI</a></td>
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<p>Factor <img class="formulaInl" alt="$180^\circ/\pi$" src="form_29.png"/> to convert from radians to degrees. </p>
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<td class="memname">#define SQRT2   1.4142135623730950488</td>
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<p><img class="formulaInl" alt="$\sqrt{2}$" src="form_66.png"/>, 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>
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<td class="memname">#define SQRT2INV   1.0/<a class="el" href="wcsmath_8h.html#a514396dd60fa0621c83072091fb2a0cd">SQRT2</a></td>
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<p><img class="formulaInl" alt="$1/\sqrt{2}$" src="form_67.png"/>, 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>
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<td class="memname">#define UNDEFINED   987654321.0e99</td>
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<p>Value used to indicate an undefined quantity (noting that NaNs cannot be used portably). </p>
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<td class="memname">#define undefined</td>
<td>(</td>
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<td class="paramname">value)</td><td></td>
<td>   (value == <a class="el" href="wcsmath_8h.html#a2dc3870be25a19efa2940150507aaf71">UNDEFINED</a>)</td>
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<p>Macro used to test for an undefined value. </p>
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