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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam
date Tue, 19 Nov 2019 14:52:55 +0000
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+<!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 3.3.8, 24 May 2018).
+
+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 6.3, http://www.gnu.org/software/texinfo/ -->
+<head>
+<title>FFTW 3.3.8: FFTW Constants in Fortran</title>
+
+<meta name="description" content="FFTW 3.3.8: FFTW Constants in Fortran">
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+<link href="index.html#Top" rel="start" title="Top">
+<link href="Concept-Index.html#Concept-Index" 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#Calling-FFTW-from-Legacy-Fortran" rel="up" title="Calling FFTW from Legacy Fortran">
+<link href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" rel="next" title="FFTW Execution in Fortran">
+<link href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" rel="prev" title="Fortran-interface routines">
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+</head>
+
+<body lang="en">
+<a name="FFTW-Constants-in-Fortran"></a>
+<div class="header">
+<p>
+Next: <a href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" accesskey="n" rel="next">FFTW Execution in Fortran</a>, Previous: <a href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines" accesskey="p" rel="prev">Fortran-interface routines</a>, Up: <a href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran" accesskey="u" rel="up">Calling FFTW from Legacy Fortran</a> &nbsp; [<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>
+</div>
+<hr>
+<a name="FFTW-Constants-in-Fortran-1"></a>
+<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&rsquo;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>
+<a name="index-flags-9"></a>
+<p>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
+<code>FFTW_MEASURE</code>) using the &lsquo;<samp><code>|</code></samp>&rsquo; operator; in Fortran
+you should just use &lsquo;<samp><code>+</code></samp>&rsquo;.  (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>