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1 <html lang="en">
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2 <head>
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3 <title>Tutorial - FFTW 3.3.3</title>
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4 <meta http-equiv="Content-Type" content="text/html">
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5 <meta name="description" content="FFTW 3.3.3">
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6 <meta name="generator" content="makeinfo 4.13">
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7 <link title="Top" rel="start" href="index.html#Top">
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8 <link rel="prev" href="Introduction.html#Introduction" title="Introduction">
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9 <link rel="next" href="Other-Important-Topics.html#Other-Important-Topics" title="Other Important Topics">
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10 <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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11 <!--
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12 This manual is for FFTW
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13 (version 3.3.3, 25 November 2012).
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14
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15 Copyright (C) 2003 Matteo Frigo.
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16
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17 Copyright (C) 2003 Massachusetts Institute of Technology.
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18
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19 Permission is granted to make and distribute verbatim copies of
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20 this manual provided the copyright notice and this permission
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21 notice are preserved on all copies.
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22
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23 Permission is granted to copy and distribute modified versions of
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24 this manual under the conditions for verbatim copying, provided
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25 that the entire resulting derived work is distributed under the
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26 terms of a permission notice identical to this one.
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27
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28 Permission is granted to copy and distribute translations of this
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29 manual into another language, under the above conditions for
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30 modified versions, except that this permission notice may be
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31 stated in a translation approved by the Free Software Foundation.
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32 -->
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33 <meta http-equiv="Content-Style-Type" content="text/css">
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34 <style type="text/css"><!--
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43 span.sansserif { font-family:sans-serif; font-weight:normal; }
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44 --></style>
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45 </head>
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46 <body>
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47 <div class="node">
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48 <a name="Tutorial"></a>
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49 <p>
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50 Next: <a rel="next" accesskey="n" href="Other-Important-Topics.html#Other-Important-Topics">Other Important Topics</a>,
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51 Previous: <a rel="previous" accesskey="p" href="Introduction.html#Introduction">Introduction</a>,
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52 Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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53 <hr>
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54 </div>
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55
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56 <h2 class="chapter">2 Tutorial</h2>
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57
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58 <ul class="menu">
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59 <li><a accesskey="1" href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs">Complex One-Dimensional DFTs</a>
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60 <li><a accesskey="2" href="Complex-Multi_002dDimensional-DFTs.html#Complex-Multi_002dDimensional-DFTs">Complex Multi-Dimensional DFTs</a>
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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>
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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>
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63 <li><a accesskey="5" href="More-DFTs-of-Real-Data.html#More-DFTs-of-Real-Data">More DFTs of Real Data</a>
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64 </ul>
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65
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66 <p>This chapter describes the basic usage of FFTW, i.e., how to compute
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67 <a name="index-basic-interface-14"></a>the Fourier transform of a single array. This chapter tells the
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68 truth, but not the <em>whole</em> truth. Specifically, FFTW implements
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69 additional routines and flags that are not documented here, although
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70 in many cases we try to indicate where added capabilities exist. For
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71 more complete information, see <a href="FFTW-Reference.html#FFTW-Reference">FFTW Reference</a>. (Note that you
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72 need to compile and install FFTW before you can use it in a program.
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73 For the details of the installation, see <a href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a>.)
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74
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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
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76 main interest lies in one of the other transform types.
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77
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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>.
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79
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80 <!-- -->
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81 <div class="footnote">
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82 <hr>
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83 <h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> You can
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84 read the tutorial in bit-reversed order after computing your first
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85 transform.</p>
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86
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87 <hr></div>
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88
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89 </body></html>
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90
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