mirror of
https://github.com/tildearrow/furnace.git
synced 2024-11-01 18:42:40 +00:00
93 lines
4.3 KiB
HTML
93 lines
4.3 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- This manual is for FFTW
|
|
(version 3.3.10, 10 December 2020).
|
|
|
|
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. -->
|
|
<!-- Created by GNU Texinfo 6.7, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<title>FFTW Constants in Fortran (FFTW 3.3.10)</title>
|
|
|
|
<meta name="description" content="FFTW Constants in Fortran (FFTW 3.3.10)">
|
|
<meta name="keywords" content="FFTW Constants in Fortran (FFTW 3.3.10)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<link href="index.html" rel="start" title="Top">
|
|
<link href="Concept-Index.html" rel="index" title="Concept Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Calling-FFTW-from-Legacy-Fortran.html" rel="up" title="Calling FFTW from Legacy Fortran">
|
|
<link href="FFTW-Execution-in-Fortran.html" rel="next" title="FFTW Execution in Fortran">
|
|
<link href="Fortran_002dinterface-routines.html" rel="prev" title="Fortran-interface routines">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<span id="FFTW-Constants-in-Fortran"></span><div class="header">
|
|
<p>
|
|
Next: <a href="FFTW-Execution-in-Fortran.html" accesskey="n" rel="next">FFTW Execution in Fortran</a>, Previous: <a href="Fortran_002dinterface-routines.html" accesskey="p" rel="prev">Fortran-interface routines</a>, Up: <a href="Calling-FFTW-from-Legacy-Fortran.html" accesskey="u" rel="up">Calling FFTW from Legacy Fortran</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<span id="FFTW-Constants-in-Fortran-1"></span><h3 class="section">8.2 FFTW Constants in Fortran</h3>
|
|
|
|
<p>When creating plans in FFTW, a number of constants are used to specify
|
|
options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
|
|
same constants must be used with the wrapper routines, but of course the
|
|
C header files where the constants are defined can’t be incorporated
|
|
directly into Fortran code.
|
|
</p>
|
|
<p>Instead, we have placed Fortran equivalents of the FFTW constant
|
|
definitions in the file <code>fftw3.f</code>, which can be found in the same
|
|
directory as <code>fftw3.h</code>. If your Fortran compiler supports a
|
|
preprocessor of some sort, you should be able to <code>include</code> or
|
|
<code>#include</code> this file; otherwise, you can paste it directly into
|
|
your code.
|
|
</p>
|
|
<span id="index-flags-9"></span>
|
|
<p>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
|
|
<code>FFTW_MEASURE</code>) using the ‘<samp><code>|</code></samp>’ operator; in Fortran
|
|
you should just use ‘<samp><code>+</code></samp>’. (Take care not to add in the
|
|
same flag more than once, though. Alternatively, you can use the
|
|
<code>ior</code> intrinsic function standardized in Fortran 95.)
|
|
</p>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|