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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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cannam@127 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
cannam@127 2 <html>
cannam@127 3 <!-- This manual is for FFTW
cannam@127 4 (version 3.3.5, 30 July 2016).
cannam@127 5
cannam@127 6 Copyright (C) 2003 Matteo Frigo.
cannam@127 7
cannam@127 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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cannam@127 10 Permission is granted to make and distribute verbatim copies of this
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cannam@127 14 Permission is granted to copy and distribute modified versions of this
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cannam@127 23 <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
cannam@127 24 <head>
cannam@127 25 <title>FFTW 3.3.5: Tutorial</title>
cannam@127 26
cannam@127 27 <meta name="description" content="FFTW 3.3.5: Tutorial">
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cannam@127 37 <link href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs" rel="next" title="Complex One-Dimensional DFTs">
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cannam@127 69 </head>
cannam@127 70
cannam@127 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
cannam@127 72 <a name="Tutorial"></a>
cannam@127 73 <div class="header">
cannam@127 74 <p>
cannam@127 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>
cannam@127 76 </div>
cannam@127 77 <hr>
cannam@127 78 <a name="Tutorial-1"></a>
cannam@127 79 <h2 class="chapter">2 Tutorial</h2>
cannam@127 80 <table class="menu" border="0" cellspacing="0">
cannam@127 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">
cannam@127 82 </td></tr>
cannam@127 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">
cannam@127 84 </td></tr>
cannam@127 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">
cannam@127 86 </td></tr>
cannam@127 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">
cannam@127 88 </td></tr>
cannam@127 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">
cannam@127 90 </td></tr>
cannam@127 91 </table>
cannam@127 92
cannam@127 93 <p>This chapter describes the basic usage of FFTW, i.e., how to compute
cannam@127 94 <a name="index-basic-interface-1"></a>
cannam@127 95 the Fourier transform of a single array. This chapter tells the
cannam@127 96 truth, but not the <em>whole</em> truth. Specifically, FFTW implements
cannam@127 97 additional routines and flags that are not documented here, although
cannam@127 98 in many cases we try to indicate where added capabilities exist. For
cannam@127 99 more complete information, see <a href="FFTW-Reference.html#FFTW-Reference">FFTW Reference</a>. (Note that you
cannam@127 100 need to compile and install FFTW before you can use it in a program.
cannam@127 101 For the details of the installation, see <a href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a>.)
cannam@127 102 </p>
cannam@127 103 <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
cannam@127 104 main interest lies in one of the other transform types.
cannam@127 105 </p>
cannam@127 106 <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>.
cannam@127 107 </p>
cannam@127 108 <div class="footnote">
cannam@127 109 <hr>
cannam@127 110 <h4 class="footnotes-heading">Footnotes</h4>
cannam@127 111
cannam@127 112 <h3><a name="FOOT1" href="#DOCF1">(1)</a></h3>
cannam@127 113 <p>You can
cannam@127 114 read the tutorial in bit-reversed order after computing your first
cannam@127 115 transform.</p>
cannam@127 116 </div>
cannam@127 117
cannam@127 118
cannam@127 119
cannam@127 120 </body>
cannam@127 121 </html>