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Add null config files
author Chris Cannam <cannam@all-day-breakfast.com>
date Mon, 02 Mar 2020 14:03:47 +0000
parents bd3cc4d1df30
children
rev   line source
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cannam@167 3 <!-- This manual is for FFTW
cannam@167 4 (version 3.3.8, 24 May 2018).
cannam@167 5
cannam@167 6 Copyright (C) 2003 Matteo Frigo.
cannam@167 7
cannam@167 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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cannam@167 24 <head>
cannam@167 25 <title>FFTW 3.3.8: FFTW Constants in Fortran</title>
cannam@167 26
cannam@167 27 <meta name="description" content="FFTW 3.3.8: FFTW Constants in Fortran">
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cannam@167 36 <link href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran" rel="up" title="Calling FFTW from Legacy Fortran">
cannam@167 37 <link href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran" rel="next" title="FFTW Execution in Fortran">
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cannam@167 68 </head>
cannam@167 69
cannam@167 70 <body lang="en">
cannam@167 71 <a name="FFTW-Constants-in-Fortran"></a>
cannam@167 72 <div class="header">
cannam@167 73 <p>
cannam@167 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>
cannam@167 75 </div>
cannam@167 76 <hr>
cannam@167 77 <a name="FFTW-Constants-in-Fortran-1"></a>
cannam@167 78 <h3 class="section">8.2 FFTW Constants in Fortran</h3>
cannam@167 79
cannam@167 80 <p>When creating plans in FFTW, a number of constants are used to specify
cannam@167 81 options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
cannam@167 82 same constants must be used with the wrapper routines, but of course the
cannam@167 83 C header files where the constants are defined can&rsquo;t be incorporated
cannam@167 84 directly into Fortran code.
cannam@167 85 </p>
cannam@167 86 <p>Instead, we have placed Fortran equivalents of the FFTW constant
cannam@167 87 definitions in the file <code>fftw3.f</code>, which can be found in the same
cannam@167 88 directory as <code>fftw3.h</code>. If your Fortran compiler supports a
cannam@167 89 preprocessor of some sort, you should be able to <code>include</code> or
cannam@167 90 <code>#include</code> this file; otherwise, you can paste it directly into
cannam@167 91 your code.
cannam@167 92 </p>
cannam@167 93 <a name="index-flags-9"></a>
cannam@167 94 <p>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
cannam@167 95 <code>FFTW_MEASURE</code>) using the &lsquo;<samp><code>|</code></samp>&rsquo; operator; in Fortran
cannam@167 96 you should just use &lsquo;<samp><code>+</code></samp>&rsquo;. (Take care not to add in the
cannam@167 97 same flag more than once, though. Alternatively, you can use the
cannam@167 98 <code>ior</code> intrinsic function standardized in Fortran 95.)
cannam@167 99 </p>
cannam@167 100
cannam@167 101
cannam@167 102
cannam@167 103 </body>
cannam@167 104 </html>