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Add null config files
author Chris Cannam <cannam@all-day-breakfast.com>
date Mon, 02 Mar 2020 14:03:47 +0000
parents bd3cc4d1df30
children
rev   line source
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.
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cannam@167 10 Permission is granted to make and distribute verbatim copies of this
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cannam@167 24 <head>
cannam@167 25 <title>FFTW 3.3.8: Guru Real-to-real Transforms</title>
cannam@167 26
cannam@167 27 <meta name="description" content="FFTW 3.3.8: Guru 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="Guru-Interface.html#Guru-Interface" rel="up" title="Guru Interface">
cannam@167 37 <link href="64_002dbit-Guru-Interface.html#g_t64_002dbit-Guru-Interface" rel="next" title="64-bit Guru Interface">
cannam@167 38 <link href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs" rel="prev" title="Guru 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="Guru-Real_002dto_002dreal-Transforms"></a>
cannam@167 72 <div class="header">
cannam@167 73 <p>
cannam@167 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>
cannam@167 75 </div>
cannam@167 76 <hr>
cannam@167 77 <a name="Guru-Real_002dto_002dreal-Transforms-1"></a>
cannam@167 78 <h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
cannam@167 79
cannam@167 80 <div class="example">
cannam@167 81 <pre class="example">fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
cannam@167 82 int howmany_rank,
cannam@167 83 const fftw_iodim *howmany_dims,
cannam@167 84 double *in, double *out,
cannam@167 85 const fftw_r2r_kind *kind,
cannam@167 86 unsigned flags);
cannam@167 87 </pre></div>
cannam@167 88 <a name="index-fftw_005fplan_005fguru_005fr2r"></a>
cannam@167 89
cannam@167 90 <p>Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
cannam@167 91 transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
cannam@167 92 over a multi-dimensional vector (loop) of dimensions
cannam@167 93 (<code>howmany_rank</code>, <code>howmany_dims</code>). <code>dims</code> and
cannam@167 94 <code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
cannam@167 95 <code>rank</code> and <code>howmany_rank</code>, respectively.
cannam@167 96 </p>
cannam@167 97 <p>The transform kind of each dimension is given by the <code>kind</code>
cannam@167 98 parameter, which should point to an array of length <code>rank</code>. Valid
cannam@167 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>.
cannam@167 100 </p>
cannam@167 101 <p><code>in</code> and <code>out</code> point to the real input and output arrays; they
cannam@167 102 may be the same, indicating an in-place transform.
cannam@167 103 </p>
cannam@167 104 <a name="index-flags-7"></a>
cannam@167 105 <p><code>flags</code> is a bitwise OR (&lsquo;<samp>|</samp>&rsquo;) of zero or more planner flags,
cannam@167 106 as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
cannam@167 107 </p>
cannam@167 108
cannam@167 109
cannam@167 110
cannam@167 111 </body>
cannam@167 112 </html>