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Current fftw source
author Chris Cannam
date Tue, 18 Oct 2016 13:40:26 +0100
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Chris@42 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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Chris@42 3 <!-- This manual is for FFTW
Chris@42 4 (version 3.3.5, 30 July 2016).
Chris@42 5
Chris@42 6 Copyright (C) 2003 Matteo Frigo.
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Chris@42 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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Chris@42 24 <head>
Chris@42 25 <title>FFTW 3.3.5: Advanced Real-to-real Transforms</title>
Chris@42 26
Chris@42 27 <meta name="description" content="FFTW 3.3.5: Advanced Real-to-real Transforms">
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Chris@42 35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
Chris@42 36 <link href="Advanced-Interface.html#Advanced-Interface" rel="up" title="Advanced Interface">
Chris@42 37 <link href="Guru-Interface.html#Guru-Interface" rel="next" title="Guru Interface">
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Chris@42 69 </head>
Chris@42 70
Chris@42 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
Chris@42 72 <a name="Advanced-Real_002dto_002dreal-Transforms"></a>
Chris@42 73 <div class="header">
Chris@42 74 <p>
Chris@42 75 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>
Chris@42 76 </div>
Chris@42 77 <hr>
Chris@42 78 <a name="Advanced-Real_002dto_002dreal-Transforms-1"></a>
Chris@42 79 <h4 class="subsection">4.4.3 Advanced Real-to-real Transforms</h4>
Chris@42 80
Chris@42 81 <div class="example">
Chris@42 82 <pre class="example">fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
Chris@42 83 double *in, const int *inembed,
Chris@42 84 int istride, int idist,
Chris@42 85 double *out, const int *onembed,
Chris@42 86 int ostride, int odist,
Chris@42 87 const fftw_r2r_kind *kind, unsigned flags);
Chris@42 88 </pre></div>
Chris@42 89 <a name="index-fftw_005fplan_005fmany_005fr2r"></a>
Chris@42 90
Chris@42 91 <p>Like <code>fftw_plan_many_dft</code>, this functions adds <code>howmany</code>,
Chris@42 92 <code>nembed</code>, <code>stride</code>, and <code>dist</code> parameters to the
Chris@42 93 <code>fftw_plan_r2r</code> function, but otherwise behave the same as the
Chris@42 94 basic interface. The interpretation of those additional parameters are
Chris@42 95 the same as for <code>fftw_plan_many_dft</code>. (Of course, the
Chris@42 96 <code>stride</code> and <code>dist</code> parameters are now in units of
Chris@42 97 <code>double</code>, not <code>fftw_complex</code>.)
Chris@42 98 </p>
Chris@42 99 <p>Arrays <code>n</code>, <code>inembed</code>, <code>onembed</code>, and <code>kind</code> are not
Chris@42 100 used after this function returns. You can safely free or reuse them.
Chris@42 101 </p>
Chris@42 102
Chris@42 103
Chris@42 104
Chris@42 105 </body>
Chris@42 106 </html>