mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-18 10:35:11 +00:00
101 lines
4.6 KiB
HTML
101 lines
4.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- This manual is for FFTW
|
|
(version 3.3.10, 10 December 2020).
|
|
|
|
Copyright (C) 2003 Matteo Frigo.
|
|
|
|
Copyright (C) 2003 Massachusetts Institute of Technology.
|
|
|
|
Permission is granted to make and distribute verbatim copies of this
|
|
manual provided the copyright notice and this permission notice are
|
|
preserved on all copies.
|
|
|
|
Permission is granted to copy and distribute modified versions of this
|
|
manual under the conditions for verbatim copying, provided that the
|
|
entire resulting derived work is distributed under the terms of a
|
|
permission notice identical to this one.
|
|
|
|
Permission is granted to copy and distribute translations of this manual
|
|
into another language, under the above conditions for modified versions,
|
|
except that this permission notice may be stated in a translation
|
|
approved by the Free Software Foundation. -->
|
|
<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<title>Guru Real-to-real Transforms (FFTW 3.3.10)</title>
|
|
|
|
<meta name="description" content="Guru Real-to-real Transforms (FFTW 3.3.10)">
|
|
<meta name="keywords" content="Guru Real-to-real Transforms (FFTW 3.3.10)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<link href="index.html" rel="start" title="Top">
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Guru-Interface.html" rel="up" title="Guru Interface">
|
|
<link href="64_002dbit-Guru-Interface.html" rel="next" title="64-bit Guru Interface">
|
|
<link href="Guru-Real_002ddata-DFTs.html" rel="prev" title="Guru Real-data DFTs">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<span id="Guru-Real_002dto_002dreal-Transforms"></span><div class="header">
|
|
<p>
|
|
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>
|
|
</div>
|
|
<hr>
|
|
<span id="Guru-Real_002dto_002dreal-Transforms-1"></span><h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
|
|
|
|
<div class="example">
|
|
<pre class="example">fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
|
|
int howmany_rank,
|
|
const fftw_iodim *howmany_dims,
|
|
double *in, double *out,
|
|
const fftw_r2r_kind *kind,
|
|
unsigned flags);
|
|
</pre></div>
|
|
<span id="index-fftw_005fplan_005fguru_005fr2r"></span>
|
|
|
|
<p>Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
|
|
transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
|
|
over a multi-dimensional vector (loop) of dimensions
|
|
(<code>howmany_rank</code>, <code>howmany_dims</code>). <code>dims</code> and
|
|
<code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
|
|
<code>rank</code> and <code>howmany_rank</code>, respectively.
|
|
</p>
|
|
<p>The transform kind of each dimension is given by the <code>kind</code>
|
|
parameter, which should point to an array of length <code>rank</code>. Valid
|
|
<code>fftw_r2r_kind</code> constants are given in <a href="Real_002dto_002dReal-Transform-Kinds.html">Real-to-Real Transform Kinds</a>.
|
|
</p>
|
|
<p><code>in</code> and <code>out</code> point to the real input and output arrays; they
|
|
may be the same, indicating an in-place transform.
|
|
</p>
|
|
<span id="index-flags-7"></span>
|
|
<p><code>flags</code> is a bitwise OR (‘<samp>|</samp>’) of zero or more planner flags,
|
|
as defined in <a href="Planner-Flags.html">Planner Flags</a>.
|
|
</p>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|