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1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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2 <html>
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3 <!-- This manual is for FFTW
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4 (version 3.3.8, 24 May 2018).
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5
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6 Copyright (C) 2003 Matteo Frigo.
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7
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8 Copyright (C) 2003 Massachusetts Institute of Technology.
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9
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10 Permission is granted to make and distribute verbatim copies of this
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11 manual provided the copyright notice and this permission notice are
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12 preserved on all copies.
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13
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14 Permission is granted to copy and distribute modified versions of this
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15 manual under the conditions for verbatim copying, provided that the
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16 entire resulting derived work is distributed under the terms of a
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17 permission notice identical to this one.
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18
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19 Permission is granted to copy and distribute translations of this manual
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20 into another language, under the above conditions for modified versions,
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24 <head>
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25 <title>FFTW 3.3.8: Tutorial</title>
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26
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27 <meta name="description" content="FFTW 3.3.8: Tutorial">
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28 <meta name="keywords" content="FFTW 3.3.8: Tutorial">
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33 <link href="index.html#Top" rel="start" title="Top">
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34 <link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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36 <link href="index.html#Top" rel="up" title="Top">
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37 <link href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs" rel="next" title="Complex One-Dimensional DFTs">
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38 <link href="Introduction.html#Introduction" rel="prev" title="Introduction">
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64 -->
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65 </style>
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66
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67
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68 </head>
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69
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70 <body lang="en">
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71 <a name="Tutorial"></a>
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72 <div class="header">
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73 <p>
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74 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> [<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>
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75 </div>
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76 <hr>
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77 <a name="Tutorial-1"></a>
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78 <h2 class="chapter">2 Tutorial</h2>
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79 <table class="menu" border="0" cellspacing="0">
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80 <tr><td align="left" valign="top">• <a href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs" accesskey="1">Complex One-Dimensional DFTs</a>:</td><td> </td><td align="left" valign="top">
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81 </td></tr>
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82 <tr><td align="left" valign="top">• <a href="Complex-Multi_002dDimensional-DFTs.html#Complex-Multi_002dDimensional-DFTs" accesskey="2">Complex Multi-Dimensional DFTs</a>:</td><td> </td><td align="left" valign="top">
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83 </td></tr>
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84 <tr><td align="left" valign="top">• <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> </td><td align="left" valign="top">
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85 </td></tr>
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86 <tr><td align="left" valign="top">• <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> </td><td align="left" valign="top">
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87 </td></tr>
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88 <tr><td align="left" valign="top">• <a href="More-DFTs-of-Real-Data.html#More-DFTs-of-Real-Data" accesskey="5">More DFTs of Real Data</a>:</td><td> </td><td align="left" valign="top">
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89 </td></tr>
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90 </table>
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91
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92 <p>This chapter describes the basic usage of FFTW, i.e., how to compute
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93 <a name="index-basic-interface-1"></a>
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94 the Fourier transform of a single array. This chapter tells the
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95 truth, but not the <em>whole</em> truth. Specifically, FFTW implements
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96 additional routines and flags that are not documented here, although
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97 in many cases we try to indicate where added capabilities exist. For
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98 more complete information, see <a href="FFTW-Reference.html#FFTW-Reference">FFTW Reference</a>. (Note that you
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99 need to compile and install FFTW before you can use it in a program.
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100 For the details of the installation, see <a href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a>.)
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101 </p>
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102 <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
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103 main interest lies in one of the other transform types.
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104 </p>
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105 <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>.
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106 </p>
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107 <div class="footnote">
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108 <hr>
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109 <h4 class="footnotes-heading">Footnotes</h4>
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110
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111 <h3><a name="FOOT1" href="#DOCF1">(1)</a></h3>
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112 <p>You can
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113 read the tutorial in bit-reversed order after computing your first
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114 transform.</p>
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115 </div>
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116
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117
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118
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119 </body>
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120 </html>
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