mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-06 04:45:05 +00:00
109 lines
5.3 KiB
HTML
109 lines
5.3 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>Tutorial (FFTW 3.3.10)</title>
|
|
|
|
<meta name="description" content="Tutorial (FFTW 3.3.10)">
|
|
<meta name="keywords" content="Tutorial (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="index.html" rel="up" title="Top">
|
|
<link href="Complex-One_002dDimensional-DFTs.html" rel="next" title="Complex One-Dimensional DFTs">
|
|
<link href="Introduction.html" rel="prev" title="Introduction">
|
|
<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="Tutorial"></span><div class="header">
|
|
<p>
|
|
Next: <a href="Other-Important-Topics.html" accesskey="n" rel="next">Other Important Topics</a>, Previous: <a href="Introduction.html" accesskey="p" rel="prev">Introduction</a>, Up: <a href="index.html" accesskey="u" rel="up">Top</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="Tutorial-1"></span><h2 class="chapter">2 Tutorial</h2>
|
|
<table class="menu" border="0" cellspacing="0">
|
|
<tr><td align="left" valign="top">• <a href="Complex-One_002dDimensional-DFTs.html" accesskey="1">Complex One-Dimensional DFTs</a></td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Complex-Multi_002dDimensional-DFTs.html" accesskey="2">Complex Multi-Dimensional DFTs</a></td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="One_002dDimensional-DFTs-of-Real-Data.html" accesskey="3">One-Dimensional DFTs of Real Data</a></td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="Multi_002dDimensional-DFTs-of-Real-Data.html" accesskey="4">Multi-Dimensional DFTs of Real Data</a></td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
<tr><td align="left" valign="top">• <a href="More-DFTs-of-Real-Data.html" accesskey="5">More DFTs of Real Data</a></td><td> </td><td align="left" valign="top">
|
|
</td></tr>
|
|
</table>
|
|
|
|
<p>This chapter describes the basic usage of FFTW, i.e., how to compute
|
|
<span id="index-basic-interface-1"></span>
|
|
the Fourier transform of a single array. This chapter tells the
|
|
truth, but not the <em>whole</em> truth. Specifically, FFTW implements
|
|
additional routines and flags that are not documented here, although
|
|
in many cases we try to indicate where added capabilities exist. For
|
|
more complete information, see <a href="FFTW-Reference.html">FFTW Reference</a>. (Note that you
|
|
need to compile and install FFTW before you can use it in a program.
|
|
For the details of the installation, see <a href="Installation-and-Customization.html">Installation and Customization</a>.)
|
|
</p>
|
|
<p>We recommend that you read this tutorial in order.<a id="DOCF1" href="#FOOT1"><sup>1</sup></a> At the least, read the first section (see <a href="Complex-One_002dDimensional-DFTs.html">Complex One-Dimensional DFTs</a>) before reading any of the others, even if your
|
|
main interest lies in one of the other transform types.
|
|
</p>
|
|
<p>Users of FFTW version 2 and earlier may also want to read <a href="Upgrading-from-FFTW-version-2.html">Upgrading from FFTW version 2</a>.
|
|
</p>
|
|
<div class="footnote">
|
|
<hr>
|
|
<h4 class="footnotes-heading">Footnotes</h4>
|
|
|
|
<h5><a id="FOOT1" href="#DOCF1">(1)</a></h3>
|
|
<p>You can
|
|
read the tutorial in bit-reversed order after computing your first
|
|
transform.</p>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|