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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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+<html lang="en">
+<head>
+<title>Guru Real-to-real Transforms - FFTW 3.3.3</title>
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+<meta name="description" content="FFTW 3.3.3">
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+<link rel="prev" href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs" title="Guru Real-data DFTs">
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+<!--
+This manual is for FFTW
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+Copyright (C) 2003 Matteo Frigo.
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+Copyright (C) 2003 Massachusetts Institute of Technology.
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+<div class="node">
+<a name="Guru-Real-to-real-Transforms"></a>
+<a name="Guru-Real_002dto_002dreal-Transforms"></a>
+<p>
+Next:&nbsp;<a rel="next" accesskey="n" href="64_002dbit-Guru-Interface.html#g_t64_002dbit-Guru-Interface">64-bit Guru Interface</a>,
+Previous:&nbsp;<a rel="previous" accesskey="p" href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs">Guru Real-data DFTs</a>,
+Up:&nbsp;<a rel="up" accesskey="u" href="Guru-Interface.html#Guru-Interface">Guru Interface</a>
+<hr>
+</div>
+
+<h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
+
+<pre class="example">     fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
+                                  int howmany_rank,
+                                  const fftw_iodim *howmany_dims,
+                                  double *in, double *out,
+                                  const fftw_r2r_kind *kind,
+                                  unsigned flags);
+</pre>
+   <p><a name="index-fftw_005fplan_005fguru_005fr2r-258"></a>
+Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
+transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
+over a multi-dimensional vector (loop) of dimensions
+(<code>howmany_rank</code>, <code>howmany_dims</code>).  <code>dims</code> and
+<code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
+<code>rank</code> and <code>howmany_rank</code>, respectively.
+
+   <p>The transform kind of each dimension is given by the <code>kind</code>
+parameter, which should point to an array of length <code>rank</code>.  Valid
+<code>fftw_r2r_kind</code> constants are given in <a href="Real_002dto_002dReal-Transform-Kinds.html#Real_002dto_002dReal-Transform-Kinds">Real-to-Real Transform Kinds</a>.
+
+   <p><code>in</code> and <code>out</code> point to the real input and output arrays; they
+may be the same, indicating an in-place transform.
+
+   <p><a name="index-flags-259"></a><code>flags</code> is a bitwise OR (&lsquo;<samp><span class="samp">|</span></samp>&rsquo;) of zero or more planner flags,
+as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
+
+<!-- =========> -->
+   </body></html>
+