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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 7867fa7e1b6b
children
rev   line source
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cannam@127 3 <!-- This manual is for FFTW
cannam@127 4 (version 3.3.5, 30 July 2016).
cannam@127 5
cannam@127 6 Copyright (C) 2003 Matteo Frigo.
cannam@127 7
cannam@127 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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cannam@127 10 Permission is granted to make and distribute verbatim copies of this
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cannam@127 24 <head>
cannam@127 25 <title>FFTW 3.3.5: Guru Real-to-real Transforms</title>
cannam@127 26
cannam@127 27 <meta name="description" content="FFTW 3.3.5: Guru Real-to-real Transforms">
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cannam@127 69 </head>
cannam@127 70
cannam@127 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
cannam@127 72 <a name="Guru-Real_002dto_002dreal-Transforms"></a>
cannam@127 73 <div class="header">
cannam@127 74 <p>
cannam@127 75 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@127 76 </div>
cannam@127 77 <hr>
cannam@127 78 <a name="Guru-Real_002dto_002dreal-Transforms-1"></a>
cannam@127 79 <h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
cannam@127 80
cannam@127 81 <div class="example">
cannam@127 82 <pre class="example">fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
cannam@127 83 int howmany_rank,
cannam@127 84 const fftw_iodim *howmany_dims,
cannam@127 85 double *in, double *out,
cannam@127 86 const fftw_r2r_kind *kind,
cannam@127 87 unsigned flags);
cannam@127 88 </pre></div>
cannam@127 89 <a name="index-fftw_005fplan_005fguru_005fr2r"></a>
cannam@127 90
cannam@127 91 <p>Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
cannam@127 92 transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
cannam@127 93 over a multi-dimensional vector (loop) of dimensions
cannam@127 94 (<code>howmany_rank</code>, <code>howmany_dims</code>). <code>dims</code> and
cannam@127 95 <code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
cannam@127 96 <code>rank</code> and <code>howmany_rank</code>, respectively.
cannam@127 97 </p>
cannam@127 98 <p>The transform kind of each dimension is given by the <code>kind</code>
cannam@127 99 parameter, which should point to an array of length <code>rank</code>. Valid
cannam@127 100 <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@127 101 </p>
cannam@127 102 <p><code>in</code> and <code>out</code> point to the real input and output arrays; they
cannam@127 103 may be the same, indicating an in-place transform.
cannam@127 104 </p>
cannam@127 105 <a name="index-flags-7"></a>
cannam@127 106 <p><code>flags</code> is a bitwise OR (&lsquo;<samp>|</samp>&rsquo;) of zero or more planner flags,
cannam@127 107 as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
cannam@127 108 </p>
cannam@127 109
cannam@127 110
cannam@127 111
cannam@127 112 </body>
cannam@127 113 </html>