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Add FFTW3
author Chris Cannam <cannam@all-day-breakfast.com>
date Wed, 20 Mar 2013 15:35:50 +0000
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1 <html lang="en">
2 <head>
3 <title>Advanced Real-to-real Transforms - FFTW 3.3.3</title>
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11 <!--
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13 (version 3.3.3, 25 November 2012).
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15 Copyright (C) 2003 Matteo Frigo.
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48 <a name="Advanced-Real-to-real-Transforms"></a>
49 <a name="Advanced-Real_002dto_002dreal-Transforms"></a>
50 <p>
51 Previous:&nbsp;<a rel="previous" accesskey="p" href="Advanced-Real_002ddata-DFTs.html#Advanced-Real_002ddata-DFTs">Advanced Real-data DFTs</a>,
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53 <hr>
54 </div>
55
56 <h4 class="subsection">4.4.3 Advanced Real-to-real Transforms</h4>
57
58 <pre class="example"> fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
59 double *in, const int *inembed,
60 int istride, int idist,
61 double *out, const int *onembed,
62 int ostride, int odist,
63 const fftw_r2r_kind *kind, unsigned flags);
64 </pre>
65 <p><a name="index-fftw_005fplan_005fmany_005fr2r-238"></a>
66 Like <code>fftw_plan_many_dft</code>, this functions adds <code>howmany</code>,
67 <code>nembed</code>, <code>stride</code>, and <code>dist</code> parameters to the
68 <code>fftw_plan_r2r</code> function, but otherwise behave the same as the
69 basic interface. The interpretation of those additional parameters are
70 the same as for <code>fftw_plan_many_dft</code>. (Of course, the
71 <code>stride</code> and <code>dist</code> parameters are now in units of
72 <code>double</code>, not <code>fftw_complex</code>.)
73
74 <p>Arrays <code>n</code>, <code>inembed</code>, <code>onembed</code>, and <code>kind</code> are not
75 used after this function returns. You can safely free or reuse them.
76
77 <!-- -->
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79