102 lines
4.6 KiB
HTML
102 lines
4.6 KiB
HTML
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<html>
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<!-- This manual is for FFTW
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(version 3.3.10, 10 December 2020).
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Copyright (C) 2003 Matteo Frigo.
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Copyright (C) 2003 Massachusetts Institute of Technology.
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Permission is granted to make and distribute verbatim copies of this
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manual provided the copyright notice and this permission notice are
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preserved on all copies.
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Permission is granted to copy and distribute modified versions of this
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manual under the conditions for verbatim copying, provided that the
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entire resulting derived work is distributed under the terms of a
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permission notice identical to this one.
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Permission is granted to copy and distribute translations of this manual
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into another language, under the above conditions for modified versions,
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except that this permission notice may be stated in a translation
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approved by the Free Software Foundation. -->
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<title>Guru Real-to-real Transforms (FFTW 3.3.10)</title>
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Guru-Interface.html" rel="up" title="Guru Interface">
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<link href="64_002dbit-Guru-Interface.html" rel="next" title="64-bit Guru Interface">
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<body lang="en">
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<span id="Guru-Real_002dto_002dreal-Transforms"></span><div class="header">
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<p>
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Next: <a href="64_002dbit-Guru-Interface.html" accesskey="n" rel="next">64-bit Guru Interface</a>, Previous: <a href="Guru-Real_002ddata-DFTs.html" accesskey="p" rel="prev">Guru Real-data DFTs</a>, Up: <a href="Guru-Interface.html" accesskey="u" rel="up">Guru Interface</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<span id="Guru-Real_002dto_002dreal-Transforms-1"></span><h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
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<div class="example">
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<pre class="example">fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
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int howmany_rank,
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const fftw_iodim *howmany_dims,
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double *in, double *out,
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const fftw_r2r_kind *kind,
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unsigned flags);
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</pre></div>
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<span id="index-fftw_005fplan_005fguru_005fr2r"></span>
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<p>Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
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transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
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over a multi-dimensional vector (loop) of dimensions
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(<code>howmany_rank</code>, <code>howmany_dims</code>). <code>dims</code> and
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<code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
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<code>rank</code> and <code>howmany_rank</code>, respectively.
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</p>
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<p>The transform kind of each dimension is given by the <code>kind</code>
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parameter, which should point to an array of length <code>rank</code>. Valid
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<code>fftw_r2r_kind</code> constants are given in <a href="Real_002dto_002dReal-Transform-Kinds.html">Real-to-Real Transform Kinds</a>.
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</p>
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<p><code>in</code> and <code>out</code> point to the real input and output arrays; they
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may be the same, indicating an in-place transform.
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</p>
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<span id="index-flags-7"></span>
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<p><code>flags</code> is a bitwise OR (‘<samp>|</samp>’) of zero or more planner flags,
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as defined in <a href="Planner-Flags.html">Planner Flags</a>.
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</p>
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</body>
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</html>
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