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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>WCSLIB 4.8.2: wcsmath.h File Reference</title>
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<h1>wcsmath.h File Reference</h1>
<p>
<a href="wcsmath_8h-source.html">Go to the source code of this file.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#598a3330b3c21701223ee0ca14316eca">PI</a> 3.141592653589793238462643</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#0a3cc1d5cde549e408f825ddd7f5853d">D2R</a> PI/180.0</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Degrees to radians conversion factor. <a href="#0a3cc1d5cde549e408f825ddd7f5853d"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#39c663074332446065723e9be9350139">R2D</a> 180.0/PI</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Radians to degrees conversion factor. <a href="#39c663074332446065723e9be9350139"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#514396dd60fa0621c83072091fb2a0cd">SQRT2</a> 1.4142135623730950488</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#01d44d9782a85952a48ed76bf105351b">SQRT2INV</a> 1.0/SQRT2</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#2dc3870be25a19efa2940150507aaf71">UNDEFINED</a> 987654321.0e99</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Value used to indicate an undefined quantity. <a href="#2dc3870be25a19efa2940150507aaf71"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="wcsmath_8h.html#dea646bef24ac88b544d7094860127ff">undefined</a>(value) (value == UNDEFINED)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Macro used to test for an undefined quantity. <a href="#dea646bef24ac88b544d7094860127ff"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Definition of mathematical constants used by WCSLIB. <hr><h2>Define Documentation</h2>
<a class="anchor" name="598a3330b3c21701223ee0ca14316eca"></a><!-- doxytag: member="wcsmath.h::PI" ref="598a3330b3c21701223ee0ca14316eca" args="" -->
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<td class="memname">#define PI 3.141592653589793238462643 </td>
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<p>
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</div><p>
<a class="anchor" name="0a3cc1d5cde549e408f825ddd7f5853d"></a><!-- doxytag: member="wcsmath.h::D2R" ref="0a3cc1d5cde549e408f825ddd7f5853d" args="" -->
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<td class="memname">#define D2R PI/180.0 </td>
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Factor <img class="formulaInl" alt="$\pi/180^\circ$" src="form_65.png"> to convert from degrees to radians.
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<a class="anchor" name="39c663074332446065723e9be9350139"></a><!-- doxytag: member="wcsmath.h::R2D" ref="39c663074332446065723e9be9350139" args="" -->
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<td class="memname">#define R2D 180.0/PI </td>
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Factor <img class="formulaInl" alt="$180^\circ/\pi$" src="form_29.png"> to convert from radians to degrees.
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<a class="anchor" name="514396dd60fa0621c83072091fb2a0cd"></a><!-- doxytag: member="wcsmath.h::SQRT2" ref="514396dd60fa0621c83072091fb2a0cd" args="" -->
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<td class="memname">#define SQRT2 1.4142135623730950488 </td>
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<img class="formulaInl" alt="$\sqrt{2}$" src="form_66.png">, used only by <a class="el" href="prj_8h.html#151140d870ed4f490317938bd6260a6a" title="Set up a prjprm struct for Mollweide's (MOL) projection.">molset()</a> (<b><code>MOL</code></b> projection).
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<a class="anchor" name="01d44d9782a85952a48ed76bf105351b"></a><!-- doxytag: member="wcsmath.h::SQRT2INV" ref="01d44d9782a85952a48ed76bf105351b" args="" -->
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<td class="memname">#define SQRT2INV 1.0/SQRT2 </td>
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<img class="formulaInl" alt="$1/\sqrt{2}$" src="form_67.png">, used only by <a class="el" href="prj_8h.html#fc5276e759c799deea36271d9cafc5e9" title="Cartesian-to-spherical transformation for the quadrilateralized spherical cube (QSC)...">qscx2s()</a> (<b><code>QSC</code></b> projection).
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<a class="anchor" name="2dc3870be25a19efa2940150507aaf71"></a><!-- doxytag: member="wcsmath.h::UNDEFINED" ref="2dc3870be25a19efa2940150507aaf71" args="" -->
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<td class="memname">#define UNDEFINED 987654321.0e99 </td>
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Value used to indicate an undefined quantity (noting that NaNs cannot be used portably).
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<a class="anchor" name="dea646bef24ac88b544d7094860127ff"></a><!-- doxytag: member="wcsmath.h::undefined" ref="dea646bef24ac88b544d7094860127ff" args="(value)" -->
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<td class="memname">#define undefined </td>
<td>(</td>
<td class="paramtype">value </td>
<td class="paramname"> </td>
<td> ) </td>
<td> (value == UNDEFINED)</td>
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<p>
Macro used to test for an undefined value.
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<hr size="1"><address style="text-align: right;"><small>Generated on Tue Oct 4 19:02:30 2011 for WCSLIB 4.8.2 by
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