cannam@95: <html lang="en"> cannam@95: <head> cannam@95: <title>Tutorial - FFTW 3.3.3</title> cannam@95: <meta http-equiv="Content-Type" content="text/html"> cannam@95: <meta name="description" content="FFTW 3.3.3"> cannam@95: <meta name="generator" content="makeinfo 4.13"> cannam@95: <link title="Top" rel="start" href="index.html#Top"> cannam@95: <link rel="prev" href="Introduction.html#Introduction" title="Introduction"> cannam@95: <link rel="next" href="Other-Important-Topics.html#Other-Important-Topics" title="Other Important Topics"> cannam@95: <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> cannam@95: <!-- cannam@95: This manual is for FFTW cannam@95: (version 3.3.3, 25 November 2012). cannam@95: cannam@95: Copyright (C) 2003 Matteo Frigo. cannam@95: cannam@95: Copyright (C) 2003 Massachusetts Institute of Technology. cannam@95: cannam@95: Permission is granted to make and distribute verbatim copies of cannam@95: this manual provided the copyright notice and this permission cannam@95: notice are preserved on all copies. cannam@95: cannam@95: Permission is granted to copy and distribute modified versions of cannam@95: this manual under the conditions for verbatim copying, provided cannam@95: that the entire resulting derived work is distributed under the cannam@95: terms of a permission notice identical to this one. cannam@95: cannam@95: Permission is granted to copy and distribute translations of this cannam@95: manual into another language, under the above conditions for cannam@95: modified versions, except that this permission notice may be cannam@95: stated in a translation approved by the Free Software Foundation. cannam@95: --> cannam@95: <meta http-equiv="Content-Style-Type" content="text/css"> cannam@95: <style type="text/css"><!-- cannam@95: pre.display { font-family:inherit } cannam@95: pre.format { font-family:inherit } cannam@95: pre.smalldisplay { font-family:inherit; font-size:smaller } cannam@95: pre.smallformat { font-family:inherit; font-size:smaller } cannam@95: pre.smallexample { font-size:smaller } cannam@95: pre.smalllisp { font-size:smaller } cannam@95: span.sc { font-variant:small-caps } cannam@95: span.roman { font-family:serif; font-weight:normal; } cannam@95: span.sansserif { font-family:sans-serif; font-weight:normal; } cannam@95: --></style> cannam@95: </head> cannam@95: <body> cannam@95: <div class="node"> cannam@95: <a name="Tutorial"></a> cannam@95: <p> cannam@95: Next: <a rel="next" accesskey="n" href="Other-Important-Topics.html#Other-Important-Topics">Other Important Topics</a>, cannam@95: Previous: <a rel="previous" accesskey="p" href="Introduction.html#Introduction">Introduction</a>, cannam@95: Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a> cannam@95: <hr> cannam@95: </div> cannam@95: cannam@95: <h2 class="chapter">2 Tutorial</h2> cannam@95: cannam@95: <ul class="menu"> cannam@95: <li><a accesskey="1" href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs">Complex One-Dimensional DFTs</a> cannam@95: <li><a accesskey="2" href="Complex-Multi_002dDimensional-DFTs.html#Complex-Multi_002dDimensional-DFTs">Complex Multi-Dimensional DFTs</a> cannam@95: <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> cannam@95: <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> cannam@95: <li><a accesskey="5" href="More-DFTs-of-Real-Data.html#More-DFTs-of-Real-Data">More DFTs of Real Data</a> cannam@95: </ul> cannam@95: cannam@95: <p>This chapter describes the basic usage of FFTW, i.e., how to compute cannam@95: <a name="index-basic-interface-14"></a>the Fourier transform of a single array. This chapter tells the cannam@95: truth, but not the <em>whole</em> truth. Specifically, FFTW implements cannam@95: additional routines and flags that are not documented here, although cannam@95: in many cases we try to indicate where added capabilities exist. For cannam@95: more complete information, see <a href="FFTW-Reference.html#FFTW-Reference">FFTW Reference</a>. (Note that you cannam@95: need to compile and install FFTW before you can use it in a program. cannam@95: For the details of the installation, see <a href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a>.) cannam@95: cannam@95: <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 cannam@95: main interest lies in one of the other transform types. cannam@95: cannam@95: <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@95: cannam@95: <!-- --> cannam@95: <div class="footnote"> cannam@95: <hr> cannam@95: <h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> You can cannam@95: read the tutorial in bit-reversed order after computing your first cannam@95: transform.</p> cannam@95: cannam@95: <hr></div> cannam@95: cannam@95: </body></html> cannam@95: