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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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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
2 <html>
3 <!-- This manual is for FFTW
4 (version 3.3.8, 24 May 2018).
5
6 Copyright (C) 2003 Matteo Frigo.
7
8 Copyright (C) 2003 Massachusetts Institute of Technology.
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10 Permission is granted to make and distribute verbatim copies of this
11 manual provided the copyright notice and this permission notice are
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14 Permission is granted to copy and distribute modified versions of this
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23 <!-- Created by GNU Texinfo 6.3, http://www.gnu.org/software/texinfo/ -->
24 <head>
25 <title>FFTW 3.3.8: Guru Real-to-real Transforms</title>
26
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34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
36 <link href="Guru-Interface.html#Guru-Interface" rel="up" title="Guru Interface">
37 <link href="64_002dbit-Guru-Interface.html#g_t64_002dbit-Guru-Interface" rel="next" title="64-bit Guru Interface">
38 <link href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs" rel="prev" title="Guru Real-data DFTs">
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71 <a name="Guru-Real_002dto_002dreal-Transforms"></a>
72 <div class="header">
73 <p>
74 Next: <a href="64_002dbit-Guru-Interface.html#g_t64_002dbit-Guru-Interface" accesskey="n" rel="next">64-bit Guru Interface</a>, Previous: <a href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs" accesskey="p" rel="prev">Guru Real-data DFTs</a>, Up: <a href="Guru-Interface.html#Guru-Interface" accesskey="u" rel="up">Guru 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="Guru-Real_002dto_002dreal-Transforms-1"></a>
78 <h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
79
80 <div class="example">
81 <pre class="example">fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
82 int howmany_rank,
83 const fftw_iodim *howmany_dims,
84 double *in, double *out,
85 const fftw_r2r_kind *kind,
86 unsigned flags);
87 </pre></div>
88 <a name="index-fftw_005fplan_005fguru_005fr2r"></a>
89
90 <p>Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
91 transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
92 over a multi-dimensional vector (loop) of dimensions
93 (<code>howmany_rank</code>, <code>howmany_dims</code>). <code>dims</code> and
94 <code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
95 <code>rank</code> and <code>howmany_rank</code>, respectively.
96 </p>
97 <p>The transform kind of each dimension is given by the <code>kind</code>
98 parameter, which should point to an array of length <code>rank</code>. Valid
99 <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>.
100 </p>
101 <p><code>in</code> and <code>out</code> point to the real input and output arrays; they
102 may be the same, indicating an in-place transform.
103 </p>
104 <a name="index-flags-7"></a>
105 <p><code>flags</code> is a bitwise OR (&lsquo;<samp>|</samp>&rsquo;) of zero or more planner flags,
106 as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
107 </p>
108
109
110
111 </body>
112 </html>