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Current fftw source
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 18 Oct 2016 13:40:26 +0100
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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
2 <html>
3 <!-- This manual is for FFTW
4 (version 3.3.5, 30 July 2016).
5
6 Copyright (C) 2003 Matteo Frigo.
7
8 Copyright (C) 2003 Massachusetts Institute of Technology.
9
10 Permission is granted to make and distribute verbatim copies of this
11 manual provided the copyright notice and this permission notice are
12 preserved on all copies.
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14 Permission is granted to copy and distribute modified versions of this
15 manual under the conditions for verbatim copying, provided that the
16 entire resulting derived work is distributed under the terms of a
17 permission notice identical to this one.
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19 Permission is granted to copy and distribute translations of this manual
20 into another language, under the above conditions for modified versions,
21 except that this permission notice may be stated in a translation
22 approved by the Free Software Foundation. -->
23 <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
24 <head>
25 <title>FFTW 3.3.5: Tutorial</title>
26
27 <meta name="description" content="FFTW 3.3.5: Tutorial">
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34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
36 <link href="index.html#Top" rel="up" title="Top">
37 <link href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs" rel="next" title="Complex One-Dimensional DFTs">
38 <link href="Introduction.html#Introduction" rel="prev" title="Introduction">
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69 </head>
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71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
72 <a name="Tutorial"></a>
73 <div class="header">
74 <p>
75 Next: <a href="Other-Important-Topics.html#Other-Important-Topics" accesskey="n" rel="next">Other Important Topics</a>, Previous: <a href="Introduction.html#Introduction" accesskey="p" rel="prev">Introduction</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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>
76 </div>
77 <hr>
78 <a name="Tutorial-1"></a>
79 <h2 class="chapter">2 Tutorial</h2>
80 <table class="menu" border="0" cellspacing="0">
81 <tr><td align="left" valign="top">&bull; <a href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs" accesskey="1">Complex One-Dimensional DFTs</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
82 </td></tr>
83 <tr><td align="left" valign="top">&bull; <a href="Complex-Multi_002dDimensional-DFTs.html#Complex-Multi_002dDimensional-DFTs" accesskey="2">Complex Multi-Dimensional DFTs</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
84 </td></tr>
85 <tr><td align="left" valign="top">&bull; <a href="One_002dDimensional-DFTs-of-Real-Data.html#One_002dDimensional-DFTs-of-Real-Data" accesskey="3">One-Dimensional DFTs of Real Data</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
86 </td></tr>
87 <tr><td align="left" valign="top">&bull; <a href="Multi_002dDimensional-DFTs-of-Real-Data.html#Multi_002dDimensional-DFTs-of-Real-Data" accesskey="4">Multi-Dimensional DFTs of Real Data</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
88 </td></tr>
89 <tr><td align="left" valign="top">&bull; <a href="More-DFTs-of-Real-Data.html#More-DFTs-of-Real-Data" accesskey="5">More DFTs of Real Data</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
90 </td></tr>
91 </table>
92
93 <p>This chapter describes the basic usage of FFTW, i.e., how to compute
94 <a name="index-basic-interface-1"></a>
95 the Fourier transform of a single array. This chapter tells the
96 truth, but not the <em>whole</em> truth. Specifically, FFTW implements
97 additional routines and flags that are not documented here, although
98 in many cases we try to indicate where added capabilities exist. For
99 more complete information, see <a href="FFTW-Reference.html#FFTW-Reference">FFTW Reference</a>. (Note that you
100 need to compile and install FFTW before you can use it in a program.
101 For the details of the installation, see <a href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a>.)
102 </p>
103 <p>We recommend that you read this tutorial in order.<a name="DOCF1" href="#FOOT1"><sup>1</sup></a> At the least, read the first section (see <a href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs">Complex One-Dimensional DFTs</a>) before reading any of the others, even if your
104 main interest lies in one of the other transform types.
105 </p>
106 <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">Upgrading from FFTW version 2</a>.
107 </p>
108 <div class="footnote">
109 <hr>
110 <h4 class="footnotes-heading">Footnotes</h4>
111
112 <h3><a name="FOOT1" href="#DOCF1">(1)</a></h3>
113 <p>You can
114 read the tutorial in bit-reversed order after computing your first
115 transform.</p>
116 </div>
117
118
119
120 </body>
121 </html>