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Add FFTW3
author Chris Cannam <cannam@all-day-breakfast.com>
date Wed, 20 Mar 2013 15:35:50 +0000
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1 <html lang="en">
2 <head>
3 <title>Tutorial - FFTW 3.3.3</title>
4 <meta http-equiv="Content-Type" content="text/html">
5 <meta name="description" content="FFTW 3.3.3">
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7 <link title="Top" rel="start" href="index.html#Top">
8 <link rel="prev" href="Introduction.html#Introduction" title="Introduction">
9 <link rel="next" href="Other-Important-Topics.html#Other-Important-Topics" title="Other Important Topics">
10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
11 <!--
12 This manual is for FFTW
13 (version 3.3.3, 25 November 2012).
14
15 Copyright (C) 2003 Matteo Frigo.
16
17 Copyright (C) 2003 Massachusetts Institute of Technology.
18
19 Permission is granted to make and distribute verbatim copies of
20 this manual provided the copyright notice and this permission
21 notice are preserved on all copies.
22
23 Permission is granted to copy and distribute modified versions of
24 this manual under the conditions for verbatim copying, provided
25 that the entire resulting derived work is distributed under the
26 terms of a permission notice identical to this one.
27
28 Permission is granted to copy and distribute translations of this
29 manual into another language, under the above conditions for
30 modified versions, except that this permission notice may be
31 stated in a translation approved by the Free Software Foundation.
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45 </head>
46 <body>
47 <div class="node">
48 <a name="Tutorial"></a>
49 <p>
50 Next:&nbsp;<a rel="next" accesskey="n" href="Other-Important-Topics.html#Other-Important-Topics">Other Important Topics</a>,
51 Previous:&nbsp;<a rel="previous" accesskey="p" href="Introduction.html#Introduction">Introduction</a>,
52 Up:&nbsp;<a rel="up" accesskey="u" href="index.html#Top">Top</a>
53 <hr>
54 </div>
55
56 <h2 class="chapter">2 Tutorial</h2>
57
58 <ul class="menu">
59 <li><a accesskey="1" href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs">Complex One-Dimensional DFTs</a>
60 <li><a accesskey="2" href="Complex-Multi_002dDimensional-DFTs.html#Complex-Multi_002dDimensional-DFTs">Complex Multi-Dimensional DFTs</a>
61 <li><a accesskey="3" href="One_002dDimensional-DFTs-of-Real-Data.html#One_002dDimensional-DFTs-of-Real-Data">One-Dimensional DFTs of Real Data</a>
62 <li><a accesskey="4" href="Multi_002dDimensional-DFTs-of-Real-Data.html#Multi_002dDimensional-DFTs-of-Real-Data">Multi-Dimensional DFTs of Real Data</a>
63 <li><a accesskey="5" href="More-DFTs-of-Real-Data.html#More-DFTs-of-Real-Data">More DFTs of Real Data</a>
64 </ul>
65
66 <p>This chapter describes the basic usage of FFTW, i.e., how to compute
67 <a name="index-basic-interface-14"></a>the Fourier transform of a single array. This chapter tells the
68 truth, but not the <em>whole</em> truth. Specifically, FFTW implements
69 additional routines and flags that are not documented here, although
70 in many cases we try to indicate where added capabilities exist. For
71 more complete information, see <a href="FFTW-Reference.html#FFTW-Reference">FFTW Reference</a>. (Note that you
72 need to compile and install FFTW before you can use it in a program.
73 For the details of the installation, see <a href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a>.)
74
75 <p>We recommend that you read this tutorial in order.<a rel="footnote" href="#fn-1" name="fnd-1"><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
76 main interest lies in one of the other transform types.
77
78 <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>.
79
80 <!-- -->
81 <div class="footnote">
82 <hr>
83 <h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> You can
84 read the tutorial in bit-reversed order after computing your first
85 transform.</p>
86
87 <hr></div>
88
89 </body></html>
90