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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 19 Nov 2019 14:52:55 +0000
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cannam@167 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
cannam@167 2 <html>
cannam@167 3 <!-- This manual is for FFTW
cannam@167 4 (version 3.3.8, 24 May 2018).
cannam@167 5
cannam@167 6 Copyright (C) 2003 Matteo Frigo.
cannam@167 7
cannam@167 8 Copyright (C) 2003 Massachusetts Institute of Technology.
cannam@167 9
cannam@167 10 Permission is granted to make and distribute verbatim copies of this
cannam@167 11 manual provided the copyright notice and this permission notice are
cannam@167 12 preserved on all copies.
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cannam@167 14 Permission is granted to copy and distribute modified versions of this
cannam@167 15 manual under the conditions for verbatim copying, provided that the
cannam@167 16 entire resulting derived work is distributed under the terms of a
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cannam@167 19 Permission is granted to copy and distribute translations of this manual
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cannam@167 24 <head>
cannam@167 25 <title>FFTW 3.3.8: Advanced Real-to-real Transforms</title>
cannam@167 26
cannam@167 27 <meta name="description" content="FFTW 3.3.8: Advanced Real-to-real Transforms">
cannam@167 28 <meta name="keywords" content="FFTW 3.3.8: Advanced Real-to-real Transforms">
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cannam@167 35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
cannam@167 36 <link href="Advanced-Interface.html#Advanced-Interface" rel="up" title="Advanced Interface">
cannam@167 37 <link href="Guru-Interface.html#Guru-Interface" rel="next" title="Guru Interface">
cannam@167 38 <link href="Advanced-Real_002ddata-DFTs.html#Advanced-Real_002ddata-DFTs" rel="prev" title="Advanced Real-data DFTs">
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cannam@167 68 </head>
cannam@167 69
cannam@167 70 <body lang="en">
cannam@167 71 <a name="Advanced-Real_002dto_002dreal-Transforms"></a>
cannam@167 72 <div class="header">
cannam@167 73 <p>
cannam@167 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>
cannam@167 75 </div>
cannam@167 76 <hr>
cannam@167 77 <a name="Advanced-Real_002dto_002dreal-Transforms-1"></a>
cannam@167 78 <h4 class="subsection">4.4.3 Advanced Real-to-real Transforms</h4>
cannam@167 79
cannam@167 80 <div class="example">
cannam@167 81 <pre class="example">fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
cannam@167 82 double *in, const int *inembed,
cannam@167 83 int istride, int idist,
cannam@167 84 double *out, const int *onembed,
cannam@167 85 int ostride, int odist,
cannam@167 86 const fftw_r2r_kind *kind, unsigned flags);
cannam@167 87 </pre></div>
cannam@167 88 <a name="index-fftw_005fplan_005fmany_005fr2r"></a>
cannam@167 89
cannam@167 90 <p>Like <code>fftw_plan_many_dft</code>, this functions adds <code>howmany</code>,
cannam@167 91 <code>nembed</code>, <code>stride</code>, and <code>dist</code> parameters to the
cannam@167 92 <code>fftw_plan_r2r</code> function, but otherwise behave the same as the
cannam@167 93 basic interface. The interpretation of those additional parameters are
cannam@167 94 the same as for <code>fftw_plan_many_dft</code>. (Of course, the
cannam@167 95 <code>stride</code> and <code>dist</code> parameters are now in units of
cannam@167 96 <code>double</code>, not <code>fftw_complex</code>.)
cannam@167 97 </p>
cannam@167 98 <p>Arrays <code>n</code>, <code>inembed</code>, <code>onembed</code>, and <code>kind</code> are not
cannam@167 99 used after this function returns. You can safely free or reuse them.
cannam@167 100 </p>
cannam@167 101
cannam@167 102
cannam@167 103
cannam@167 104 </body>
cannam@167 105 </html>