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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>WCSLIB 4.8.2: linprm Struct Reference</title>
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<h1>linprm Struct Reference</h1><!-- doxytag: class="linprm" -->Linear transformation parameters.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="lin_8h-source.html">lin.h</a>></code>
<p>
<table border="0" cellpadding="0" cellspacing="0">
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<tr><td colspan="2"><br><h2>Data Fields</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#5bb0b2b2ce1f160a8a70f6437a893eea">flag</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#e281f0f7ebeaf5038cc13c13946641b1">naxis</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#3691ff3f40a0ba087637d30ffc87e6d0">crpix</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#4c40bec32ec40035b8c1ef13db652270">pc</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#162762d02eaade6a53d63d70b8827caa">cdelt</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#eaaf26fd243da58fee173b075bed1de7">piximg</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#28a705f744a32cd05dd3aa86ca58998b">imgpix</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#f0a5cac7b1d2d3a0feb6905c05b122c2">unity</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#7f40c88135117b07a7767082ef24aba9">padding</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">struct <a class="el" href="structwcserr.html">wcserr</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#2975830d4214bb6b35cb1ca922875057">err</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#596f68ff17fce142f36530d72dd838c4">i_naxis</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#5ef7cce6307f640aca1080d0d5ad9ba1">m_flag</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#eefcacedf2989970f0df2c246d84bfb7">m_naxis</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#b73e780d0792b3570fcf2cf55651f22c">m_padding</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#091103ceb860eeed1a280effa0df28df">m_crpix</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#7036b8527bc8b220ad8a863442631f48">m_pc</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">double * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#5ac85757a7a46247e353a089374eb128">m_cdelt</a></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="structlinprm.html#b7a8cacb1454446f9b5a521703fcca75">padding2</a></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
The <b>linprm</b> struct contains all of the information required to perform a linear transformation. It consists of certain members that must be set by the user (<em>given</em>) and others that are set by the WCSLIB routines (<em>returned</em>). <hr><h2>Field Documentation</h2>
<a class="anchor" name="5bb0b2b2ce1f160a8a70f6437a893eea"></a><!-- doxytag: member="linprm::flag" ref="5bb0b2b2ce1f160a8a70f6437a893eea" args="" -->
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<td class="memname">int <a class="el" href="structlinprm.html#5bb0b2b2ce1f160a8a70f6437a893eea">linprm::flag</a> </td>
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<p>
(Given and returned) This flag must be set to zero whenever any of the following members of the <b>linprm</b> struct are set or modified:<p>
<ul>
<li>
<a class="el" href="structlinprm.html#e281f0f7ebeaf5038cc13c13946641b1">linprm::naxis</a> (q.v., not normally set by the user), </li>
<li>
<a class="el" href="structlinprm.html#4c40bec32ec40035b8c1ef13db652270">linprm::pc</a>, </li>
<li>
<a class="el" href="structlinprm.html#162762d02eaade6a53d63d70b8827caa">linprm::cdelt</a>. </li>
</ul>
<p>
This signals the initialization routine, <a class="el" href="lin_8h.html#5c01c0991c8d0c4437581a7c1453b09a" title="Setup routine for the linprm struct.">linset()</a>, to recompute the returned members of the <b>linprm</b> struct. <a class="el" href="lin_8h.html#5c01c0991c8d0c4437581a7c1453b09a" title="Setup routine for the linprm struct.">linset()</a> will reset flag to indicate that this has been done.<p>
<b>PLEASE NOTE:</b> flag should be set to -1 when <a class="el" href="lin_8h.html#7ddea28768d99f01c6be1c71a4d8fe58" title="Default constructor for the linprm struct.">linini()</a> is called for the first time for a particular <b>linprm</b> struct in order to initialize memory management. It must ONLY be used on the first initialization otherwise memory leaks may result.
</div>
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<a class="anchor" name="e281f0f7ebeaf5038cc13c13946641b1"></a><!-- doxytag: member="linprm::naxis" ref="e281f0f7ebeaf5038cc13c13946641b1" args="" -->
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<td class="memname">int <a class="el" href="structlinprm.html#e281f0f7ebeaf5038cc13c13946641b1">linprm::naxis</a> </td>
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<p>
(Given or returned) Number of pixel and world coordinate elements.<p>
If <a class="el" href="lin_8h.html#7ddea28768d99f01c6be1c71a4d8fe58" title="Default constructor for the linprm struct.">linini()</a> is used to initialize the <b>linprm</b> struct (as would normally be the case) then it will set naxis from the value passed to it as a function argument. The user should not subsequently modify it.
</div>
</div><p>
<a class="anchor" name="3691ff3f40a0ba087637d30ffc87e6d0"></a><!-- doxytag: member="linprm::crpix" ref="3691ff3f40a0ba087637d30ffc87e6d0" args="" -->
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<td class="memname">double * <a class="el" href="structlinprm.html#3691ff3f40a0ba087637d30ffc87e6d0">linprm::crpix</a> </td>
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<p>
(<em>Given</em>) Pointer to the first element of an array of double containing the coordinate reference pixel, <code><b>CRPIX</b>ja</code>.
</div>
</div><p>
<a class="anchor" name="4c40bec32ec40035b8c1ef13db652270"></a><!-- doxytag: member="linprm::pc" ref="4c40bec32ec40035b8c1ef13db652270" args="" -->
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<td class="memname">double * <a class="el" href="structlinprm.html#4c40bec32ec40035b8c1ef13db652270">linprm::pc</a> </td>
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<p>
(<em>Given</em>) Pointer to the first element of the <code><b>PC</b>i<b>_</b>ja</code> (pixel coordinate) transformation matrix. The expected order is <div class="fragment"><pre class="fragment"> <span class="keyword">struct </span><a class="code" href="structlinprm.html" title="Linear transformation parameters.">linprm</a> lin;
lin.pc = {PC1_1, PC1_2, PC2_1, PC2_2};
</pre></div><p>
This may be constructed conveniently from a 2-D array via <div class="fragment"><pre class="fragment"> <span class="keywordtype">double</span> m[2][2] = {{PC1_1, PC1_2},
{PC2_1, PC2_2}};
</pre></div><p>
which is equivalent to <div class="fragment"><pre class="fragment"> <span class="keywordtype">double</span> m[2][2];
m[0][0] = PC1_1;
m[0][1] = PC1_2;
m[1][0] = PC2_1;
m[1][1] = PC2_2;
</pre></div><p>
The storage order for this 2-D array is the same as for the 1-D array, whence <div class="fragment"><pre class="fragment"> lin.pc = *m;
</pre></div><p>
would be legitimate.
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<a class="anchor" name="162762d02eaade6a53d63d70b8827caa"></a><!-- doxytag: member="linprm::cdelt" ref="162762d02eaade6a53d63d70b8827caa" args="" -->
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<td class="memname">double * <a class="el" href="structlinprm.html#162762d02eaade6a53d63d70b8827caa">linprm::cdelt</a> </td>
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<p>
(<em>Given</em>) Pointer to the first element of an array of double containing the coordinate increments, <code><b>CDELT</b>ia</code>.
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<a class="anchor" name="eaaf26fd243da58fee173b075bed1de7"></a><!-- doxytag: member="linprm::piximg" ref="eaaf26fd243da58fee173b075bed1de7" args="" -->
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<td class="memname">double * <a class="el" href="structlinprm.html#eaaf26fd243da58fee173b075bed1de7">linprm::piximg</a> </td>
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<p>
(<em>Returned</em>) Pointer to the first element of the matrix containing the product of the <code><b>CDELT</b>ia</code> diagonal matrix and the <code><b>PC</b>i<b>_</b>ja</code> matrix.
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<a class="anchor" name="28a705f744a32cd05dd3aa86ca58998b"></a><!-- doxytag: member="linprm::imgpix" ref="28a705f744a32cd05dd3aa86ca58998b" args="" -->
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<td class="memname">double * <a class="el" href="structlinprm.html#28a705f744a32cd05dd3aa86ca58998b">linprm::imgpix</a> </td>
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(<em>Returned</em>) Pointer to the first element of the inverse of the <a class="el" href="structlinprm.html#eaaf26fd243da58fee173b075bed1de7">linprm::piximg</a> matrix.
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<a class="anchor" name="f0a5cac7b1d2d3a0feb6905c05b122c2"></a><!-- doxytag: member="linprm::unity" ref="f0a5cac7b1d2d3a0feb6905c05b122c2" args="" -->
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(<em>Returned</em>) True if the linear transformation matrix is unity.
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<a class="anchor" name="7f40c88135117b07a7767082ef24aba9"></a><!-- doxytag: member="linprm::padding" ref="7f40c88135117b07a7767082ef24aba9" args="" -->
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<p>
(An unused variable inserted for alignment purposes only.)
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<a class="anchor" name="2975830d4214bb6b35cb1ca922875057"></a><!-- doxytag: member="linprm::err" ref="2975830d4214bb6b35cb1ca922875057" args="" -->
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<td class="memname">struct <a class="el" href="structwcserr.html">wcserr</a> * <a class="el" href="structlinprm.html#2975830d4214bb6b35cb1ca922875057">linprm::err</a><code> [read]</code> </td>
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(<em>Returned</em>) If enabled, when an error status is returned this struct contains detailed information about the error, see <a class="el" href="wcserr_8h.html#1691b8bd184d40ca6fda255be078fa53" title="Enable/disable error messaging.">wcserr_enable()</a>.
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<a class="anchor" name="596f68ff17fce142f36530d72dd838c4"></a><!-- doxytag: member="linprm::i_naxis" ref="596f68ff17fce142f36530d72dd838c4" args="" -->
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(For internal use only.)
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<a class="anchor" name="5ef7cce6307f640aca1080d0d5ad9ba1"></a><!-- doxytag: member="linprm::m_flag" ref="5ef7cce6307f640aca1080d0d5ad9ba1" args="" -->
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(For internal use only.)
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<a class="anchor" name="eefcacedf2989970f0df2c246d84bfb7"></a><!-- doxytag: member="linprm::m_naxis" ref="eefcacedf2989970f0df2c246d84bfb7" args="" -->
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(For internal use only.)
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<a class="anchor" name="b73e780d0792b3570fcf2cf55651f22c"></a><!-- doxytag: member="linprm::m_padding" ref="b73e780d0792b3570fcf2cf55651f22c" args="" -->
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(For internal use only.)
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<a class="anchor" name="091103ceb860eeed1a280effa0df28df"></a><!-- doxytag: member="linprm::m_crpix" ref="091103ceb860eeed1a280effa0df28df" args="" -->
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<td class="memname">double * <a class="el" href="structlinprm.html#091103ceb860eeed1a280effa0df28df">linprm::m_crpix</a> </td>
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(For internal use only.)
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<a class="anchor" name="7036b8527bc8b220ad8a863442631f48"></a><!-- doxytag: member="linprm::m_pc" ref="7036b8527bc8b220ad8a863442631f48" args="" -->
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(For internal use only.)
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(For internal use only.) void *padding2 (For internal use only.)
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