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Add null config files
author Chris Cannam
date Mon, 02 Mar 2020 14:03:47 +0000
parents d0c2a83c1364
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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">
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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
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Chris@82 24 <head>
Chris@82 25 <title>FFTW 3.3.8: Guru Real-to-real Transforms</title>
Chris@82 26
Chris@82 27 <meta name="description" content="FFTW 3.3.8: Guru 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="Guru-Interface.html#Guru-Interface" rel="up" title="Guru Interface">
Chris@82 37 <link href="64_002dbit-Guru-Interface.html#g_t64_002dbit-Guru-Interface" rel="next" title="64-bit Guru Interface">
Chris@82 38 <link href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs" rel="prev" title="Guru 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="Guru-Real_002dto_002dreal-Transforms"></a>
Chris@82 72 <div class="header">
Chris@82 73 <p>
Chris@82 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>
Chris@82 75 </div>
Chris@82 76 <hr>
Chris@82 77 <a name="Guru-Real_002dto_002dreal-Transforms-1"></a>
Chris@82 78 <h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
Chris@82 79
Chris@82 80 <div class="example">
Chris@82 81 <pre class="example">fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
Chris@82 82 int howmany_rank,
Chris@82 83 const fftw_iodim *howmany_dims,
Chris@82 84 double *in, double *out,
Chris@82 85 const fftw_r2r_kind *kind,
Chris@82 86 unsigned flags);
Chris@82 87 </pre></div>
Chris@82 88 <a name="index-fftw_005fplan_005fguru_005fr2r"></a>
Chris@82 89
Chris@82 90 <p>Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
Chris@82 91 transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
Chris@82 92 over a multi-dimensional vector (loop) of dimensions
Chris@82 93 (<code>howmany_rank</code>, <code>howmany_dims</code>). <code>dims</code> and
Chris@82 94 <code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
Chris@82 95 <code>rank</code> and <code>howmany_rank</code>, respectively.
Chris@82 96 </p>
Chris@82 97 <p>The transform kind of each dimension is given by the <code>kind</code>
Chris@82 98 parameter, which should point to an array of length <code>rank</code>. Valid
Chris@82 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>.
Chris@82 100 </p>
Chris@82 101 <p><code>in</code> and <code>out</code> point to the real input and output arrays; they
Chris@82 102 may be the same, indicating an in-place transform.
Chris@82 103 </p>
Chris@82 104 <a name="index-flags-7"></a>
Chris@82 105 <p><code>flags</code> is a bitwise OR (&lsquo;<samp>|</samp>&rsquo;) of zero or more planner flags,
Chris@82 106 as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
Chris@82 107 </p>
Chris@82 108
Chris@82 109
Chris@82 110
Chris@82 111 </body>
Chris@82 112 </html>