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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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Chris@82 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
Chris@82 2 <html>
Chris@82 3 <!-- This manual is for FFTW
Chris@82 4 (version 3.3.8, 24 May 2018).
Chris@82 5
Chris@82 6 Copyright (C) 2003 Matteo Frigo.
Chris@82 7
Chris@82 8 Copyright (C) 2003 Massachusetts Institute of Technology.
Chris@82 9
Chris@82 10 Permission is granted to make and distribute verbatim copies of this
Chris@82 11 manual provided the copyright notice and this permission notice are
Chris@82 12 preserved on all copies.
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Chris@82 15 manual under the conditions for verbatim copying, provided that the
Chris@82 16 entire resulting derived work is distributed under the terms of a
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Chris@82 24 <head>
Chris@82 25 <title>FFTW 3.3.8: Advanced Real-to-real Transforms</title>
Chris@82 26
Chris@82 27 <meta name="description" content="FFTW 3.3.8: Advanced Real-to-real Transforms">
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Chris@82 34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
Chris@82 35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
Chris@82 36 <link href="Advanced-Interface.html#Advanced-Interface" rel="up" title="Advanced Interface">
Chris@82 37 <link href="Guru-Interface.html#Guru-Interface" rel="next" title="Guru Interface">
Chris@82 38 <link href="Advanced-Real_002ddata-DFTs.html#Advanced-Real_002ddata-DFTs" rel="prev" title="Advanced Real-data DFTs">
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Chris@82 66
Chris@82 67
Chris@82 68 </head>
Chris@82 69
Chris@82 70 <body lang="en">
Chris@82 71 <a name="Advanced-Real_002dto_002dreal-Transforms"></a>
Chris@82 72 <div class="header">
Chris@82 73 <p>
Chris@82 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>
Chris@82 75 </div>
Chris@82 76 <hr>
Chris@82 77 <a name="Advanced-Real_002dto_002dreal-Transforms-1"></a>
Chris@82 78 <h4 class="subsection">4.4.3 Advanced Real-to-real Transforms</h4>
Chris@82 79
Chris@82 80 <div class="example">
Chris@82 81 <pre class="example">fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
Chris@82 82 double *in, const int *inembed,
Chris@82 83 int istride, int idist,
Chris@82 84 double *out, const int *onembed,
Chris@82 85 int ostride, int odist,
Chris@82 86 const fftw_r2r_kind *kind, unsigned flags);
Chris@82 87 </pre></div>
Chris@82 88 <a name="index-fftw_005fplan_005fmany_005fr2r"></a>
Chris@82 89
Chris@82 90 <p>Like <code>fftw_plan_many_dft</code>, this functions adds <code>howmany</code>,
Chris@82 91 <code>nembed</code>, <code>stride</code>, and <code>dist</code> parameters to the
Chris@82 92 <code>fftw_plan_r2r</code> function, but otherwise behave the same as the
Chris@82 93 basic interface. The interpretation of those additional parameters are
Chris@82 94 the same as for <code>fftw_plan_many_dft</code>. (Of course, the
Chris@82 95 <code>stride</code> and <code>dist</code> parameters are now in units of
Chris@82 96 <code>double</code>, not <code>fftw_complex</code>.)
Chris@82 97 </p>
Chris@82 98 <p>Arrays <code>n</code>, <code>inembed</code>, <code>onembed</code>, and <code>kind</code> are not
Chris@82 99 used after this function returns. You can safely free or reuse them.
Chris@82 100 </p>
Chris@82 101
Chris@82 102
Chris@82 103
Chris@82 104 </body>
Chris@82 105 </html>