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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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Chris@82 1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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Chris@82 3 <!-- This manual is for FFTW
Chris@82 4 (version 3.3.8, 24 May 2018).
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Chris@82 6 Copyright (C) 2003 Matteo Frigo.
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Chris@82 24 <head>
Chris@82 25 <title>FFTW 3.3.8: FFTW Constants in Fortran</title>
Chris@82 26
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Chris@82 35 <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
Chris@82 36 <link href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran" rel="up" title="Calling FFTW from Legacy Fortran">
Chris@82 37 <link href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" rel="next" title="FFTW Execution in Fortran">
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Chris@82 68 </head>
Chris@82 69
Chris@82 70 <body lang="en">
Chris@82 71 <a name="FFTW-Constants-in-Fortran"></a>
Chris@82 72 <div class="header">
Chris@82 73 <p>
Chris@82 74 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>
Chris@82 75 </div>
Chris@82 76 <hr>
Chris@82 77 <a name="FFTW-Constants-in-Fortran-1"></a>
Chris@82 78 <h3 class="section">8.2 FFTW Constants in Fortran</h3>
Chris@82 79
Chris@82 80 <p>When creating plans in FFTW, a number of constants are used to specify
Chris@82 81 options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
Chris@82 82 same constants must be used with the wrapper routines, but of course the
Chris@82 83 C header files where the constants are defined can&rsquo;t be incorporated
Chris@82 84 directly into Fortran code.
Chris@82 85 </p>
Chris@82 86 <p>Instead, we have placed Fortran equivalents of the FFTW constant
Chris@82 87 definitions in the file <code>fftw3.f</code>, which can be found in the same
Chris@82 88 directory as <code>fftw3.h</code>. If your Fortran compiler supports a
Chris@82 89 preprocessor of some sort, you should be able to <code>include</code> or
Chris@82 90 <code>#include</code> this file; otherwise, you can paste it directly into
Chris@82 91 your code.
Chris@82 92 </p>
Chris@82 93 <a name="index-flags-9"></a>
Chris@82 94 <p>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
Chris@82 95 <code>FFTW_MEASURE</code>) using the &lsquo;<samp><code>|</code></samp>&rsquo; operator; in Fortran
Chris@82 96 you should just use &lsquo;<samp><code>+</code></samp>&rsquo;. (Take care not to add in the
Chris@82 97 same flag more than once, though. Alternatively, you can use the
Chris@82 98 <code>ior</code> intrinsic function standardized in Fortran 95.)
Chris@82 99 </p>
Chris@82 100
Chris@82 101
Chris@82 102
Chris@82 103 </body>
Chris@82 104 </html>