Mercurial > hg > sv-dependency-builds

<html lang="en">
<head>
<title>Tutorial - FFTW 3.3.3</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="FFTW 3.3.3">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="prev" href="Introduction.html#Introduction" title="Introduction">
<link rel="next" href="Other-Important-Topics.html#Other-Important-Topics" title="Other Important Topics">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
This manual is for FFTW
(version 3.3.3, 25 November 2012).

Copyright (C) 2003 Matteo Frigo.

Copyright (C) 2003 Massachusetts Institute of Technology.

     Permission is granted to make and distribute verbatim copies of
     this manual provided the copyright notice and this permission
     notice are preserved on all copies.

     Permission is granted to copy and distribute modified versions of
     this manual under the conditions for verbatim copying, provided
     that the entire resulting derived work is distributed under the
     terms of a permission notice identical to this one.

     Permission is granted to copy and distribute translations of this
     manual into another language, under the above conditions for
     modified versions, except that this permission notice may be
     stated in a translation approved by the Free Software Foundation.
   -->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
  pre.display { font-family:inherit }
  pre.format  { font-family:inherit }
  pre.smalldisplay { font-family:inherit; font-size:smaller }
  pre.smallformat  { font-family:inherit; font-size:smaller }
  pre.smallexample { font-size:smaller }
  pre.smalllisp    { font-size:smaller }
  span.sc    { font-variant:small-caps }
  span.roman { font-family:serif; font-weight:normal; }
  span.sansserif { font-family:sans-serif; font-weight:normal; }
--></style>
</head>
<body>
<div class="node">
<a name="Tutorial"></a>
<p>
Next:&nbsp;<a rel="next" accesskey="n" href="Other-Important-Topics.html#Other-Important-Topics">Other Important Topics</a>,
Previous:&nbsp;<a rel="previous" accesskey="p" href="Introduction.html#Introduction">Introduction</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="index.html#Top">Top</a>
<hr>
</div>

<h2 class="chapter">2 Tutorial</h2>

<ul class="menu">
<li><a accesskey="1" href="Complex-One_002dDimensional-DFTs.html#Complex-One_002dDimensional-DFTs">Complex One-Dimensional DFTs</a>
<li><a accesskey="2" href="Complex-Multi_002dDimensional-DFTs.html#Complex-Multi_002dDimensional-DFTs">Complex Multi-Dimensional DFTs</a>
<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>
<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>
<li><a accesskey="5" href="More-DFTs-of-Real-Data.html#More-DFTs-of-Real-Data">More DFTs of Real Data</a>
</ul>

<p>This chapter describes the basic usage of FFTW, i.e., how to compute
<a name="index-basic-interface-14"></a>the Fourier transform of a single array.  This chapter tells the
truth, but not the <em>whole</em> truth. Specifically, FFTW implements
additional routines and flags that are not documented here, although
in many cases we try to indicate where added capabilities exist.  For
more complete information, see <a href="FFTW-Reference.html#FFTW-Reference">FFTW Reference</a>.  (Note that you
need to compile and install FFTW before you can use it in a program.
For the details of the installation, see <a href="Installation-and-Customization.html#Installation-and-Customization">Installation and Customization</a>.)

   <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
main interest lies in one of the other transform types.

   <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>.

<!--  -->
   <div class="footnote">
<hr>
<h4>Footnotes</h4><p class="footnote"><small>[<a name="fn-1" href="#fnd-1">1</a>]</small> You can
read the tutorial in bit-reversed order after computing your first
transform.</p>

   <hr></div>

   </body></html>
author	Chris Cannam <cannam@all-day-breakfast.com>
date	Mon, 02 Mar 2020 14:03:47 +0000
parents	89f5e221ed7b
children