95 lines
4.2 KiB
HTML
95 lines
4.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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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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<head>
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<title>Advanced Real-to-real Transforms (FFTW 3.3.10)</title>
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<meta name="description" content="Advanced Real-to-real Transforms (FFTW 3.3.10)">
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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="Advanced-Interface.html" rel="up" title="Advanced Interface">
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<link href="Guru-Interface.html" rel="next" title="Guru Interface">
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<link href="Advanced-Real_002ddata-DFTs.html" rel="prev" title="Advanced Real-data DFTs">
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<body lang="en">
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<span id="Advanced-Real_002dto_002dreal-Transforms"></span><div class="header">
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<p>
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Previous: <a href="Advanced-Real_002ddata-DFTs.html" accesskey="p" rel="prev">Advanced Real-data DFTs</a>, Up: <a href="Advanced-Interface.html" accesskey="u" rel="up">Advanced 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="Advanced-Real_002dto_002dreal-Transforms-1"></span><h4 class="subsection">4.4.3 Advanced Real-to-real Transforms</h4>
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<div class="example">
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<pre class="example">fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
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double *in, const int *inembed,
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int istride, int idist,
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double *out, const int *onembed,
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int ostride, int odist,
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const fftw_r2r_kind *kind, unsigned flags);
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</pre></div>
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<span id="index-fftw_005fplan_005fmany_005fr2r"></span>
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<p>Like <code>fftw_plan_many_dft</code>, this functions adds <code>howmany</code>,
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<code>nembed</code>, <code>stride</code>, and <code>dist</code> parameters to the
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<code>fftw_plan_r2r</code> function, but otherwise behave the same as the
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basic interface. The interpretation of those additional parameters are
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the same as for <code>fftw_plan_many_dft</code>. (Of course, the
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<code>stride</code> and <code>dist</code> parameters are now in units of
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<code>double</code>, not <code>fftw_complex</code>.)
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</p>
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<p>Arrays <code>n</code>, <code>inembed</code>, <code>onembed</code>, and <code>kind</code> are not
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used after this function returns. You can safely free or reuse them.
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</p>
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</body>
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</html>
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