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Add FFTW 3.3.8 source, and a Linux build
author Chris Cannam <cannam@all-day-breakfast.com>
date Tue, 19 Nov 2019 14:52:55 +0000
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3 <!-- This manual is for FFTW
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6 Copyright (C) 2003 Matteo Frigo.
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25 <title>FFTW 3.3.8: FFTW Constants in Fortran</title>
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71 <a name="FFTW-Constants-in-Fortran"></a>
72 <div class="header">
73 <p>
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>
75 </div>
76 <hr>
77 <a name="FFTW-Constants-in-Fortran-1"></a>
78 <h3 class="section">8.2 FFTW Constants in Fortran</h3>
79
80 <p>When creating plans in FFTW, a number of constants are used to specify
81 options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
82 same constants must be used with the wrapper routines, but of course the
83 C header files where the constants are defined can&rsquo;t be incorporated
84 directly into Fortran code.
85 </p>
86 <p>Instead, we have placed Fortran equivalents of the FFTW constant
87 definitions in the file <code>fftw3.f</code>, which can be found in the same
88 directory as <code>fftw3.h</code>. If your Fortran compiler supports a
89 preprocessor of some sort, you should be able to <code>include</code> or
90 <code>#include</code> this file; otherwise, you can paste it directly into
91 your code.
92 </p>
93 <a name="index-flags-9"></a>
94 <p>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
95 <code>FFTW_MEASURE</code>) using the &lsquo;<samp><code>|</code></samp>&rsquo; operator; in Fortran
96 you should just use &lsquo;<samp><code>+</code></samp>&rsquo;. (Take care not to add in the
97 same flag more than once, though. Alternatively, you can use the
98 <code>ior</code> intrinsic function standardized in Fortran 95.)
99 </p>
100
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