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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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3 <title>Guru Real-to-real Transforms - FFTW 3.3.3</title>
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57
58 <h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
59
60 <pre class="example"> fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
61 int howmany_rank,
62 const fftw_iodim *howmany_dims,
63 double *in, double *out,
64 const fftw_r2r_kind *kind,
65 unsigned flags);
66 </pre>
67 <p><a name="index-fftw_005fplan_005fguru_005fr2r-258"></a>
68 Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
69 transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
70 over a multi-dimensional vector (loop) of dimensions
71 (<code>howmany_rank</code>, <code>howmany_dims</code>). <code>dims</code> and
72 <code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
73 <code>rank</code> and <code>howmany_rank</code>, respectively.
74
75 <p>The transform kind of each dimension is given by the <code>kind</code>
76 parameter, which should point to an array of length <code>rank</code>. Valid
77 <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>.
78
79 <p><code>in</code> and <code>out</code> point to the real input and output arrays; they
80 may be the same, indicating an in-place transform.
81
82 <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,
83 as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
84
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