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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam
date Tue, 19 Nov 2019 14:52:55 +0000
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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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3 <!-- This manual is for FFTW
4 (version 3.3.8, 24 May 2018).
5
6 Copyright (C) 2003 Matteo Frigo.
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8 Copyright (C) 2003 Massachusetts Institute of Technology.
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25 <title>FFTW 3.3.8: Advanced Real-to-real Transforms</title>
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71 <a name="Advanced-Real_002dto_002dreal-Transforms"></a>
72 <div class="header">
73 <p>
74 Previous: <a href="Advanced-Real_002ddata-DFTs.html#Advanced-Real_002ddata-DFTs" accesskey="p" rel="prev">Advanced Real-data DFTs</a>, Up: <a href="Advanced-Interface.html#Advanced-Interface" accesskey="u" rel="up">Advanced Interface</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
75 </div>
76 <hr>
77 <a name="Advanced-Real_002dto_002dreal-Transforms-1"></a>
78 <h4 class="subsection">4.4.3 Advanced Real-to-real Transforms</h4>
79
80 <div class="example">
81 <pre class="example">fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
82 double *in, const int *inembed,
83 int istride, int idist,
84 double *out, const int *onembed,
85 int ostride, int odist,
86 const fftw_r2r_kind *kind, unsigned flags);
87 </pre></div>
88 <a name="index-fftw_005fplan_005fmany_005fr2r"></a>
89
90 <p>Like <code>fftw_plan_many_dft</code>, this functions adds <code>howmany</code>,
91 <code>nembed</code>, <code>stride</code>, and <code>dist</code> parameters to the
92 <code>fftw_plan_r2r</code> function, but otherwise behave the same as the
93 basic interface. The interpretation of those additional parameters are
94 the same as for <code>fftw_plan_many_dft</code>. (Of course, the
95 <code>stride</code> and <code>dist</code> parameters are now in units of
96 <code>double</code>, not <code>fftw_complex</code>.)
97 </p>
98 <p>Arrays <code>n</code>, <code>inembed</code>, <code>onembed</code>, and <code>kind</code> are not
99 used after this function returns. You can safely free or reuse them.
100 </p>
101
102
103
104 </body>
105 </html>