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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 7867fa7e1b6b
children
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cannam@127 3 <!-- This manual is for FFTW
cannam@127 4 (version 3.3.5, 30 July 2016).
cannam@127 5
cannam@127 6 Copyright (C) 2003 Matteo Frigo.
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cannam@127 8 Copyright (C) 2003 Massachusetts Institute of Technology.
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cannam@127 24 <head>
cannam@127 25 <title>FFTW 3.3.5: FFTW Constants in Fortran</title>
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cannam@127 71 <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
cannam@127 72 <a name="FFTW-Constants-in-Fortran"></a>
cannam@127 73 <div class="header">
cannam@127 74 <p>
cannam@127 75 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@127 76 </div>
cannam@127 77 <hr>
cannam@127 78 <a name="FFTW-Constants-in-Fortran-1"></a>
cannam@127 79 <h3 class="section">8.2 FFTW Constants in Fortran</h3>
cannam@127 80
cannam@127 81 <p>When creating plans in FFTW, a number of constants are used to specify
cannam@127 82 options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
cannam@127 83 same constants must be used with the wrapper routines, but of course the
cannam@127 84 C header files where the constants are defined can&rsquo;t be incorporated
cannam@127 85 directly into Fortran code.
cannam@127 86 </p>
cannam@127 87 <p>Instead, we have placed Fortran equivalents of the FFTW constant
cannam@127 88 definitions in the file <code>fftw3.f</code>, which can be found in the same
cannam@127 89 directory as <code>fftw3.h</code>. If your Fortran compiler supports a
cannam@127 90 preprocessor of some sort, you should be able to <code>include</code> or
cannam@127 91 <code>#include</code> this file; otherwise, you can paste it directly into
cannam@127 92 your code.
cannam@127 93 </p>
cannam@127 94 <a name="index-flags-9"></a>
cannam@127 95 <p>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
cannam@127 96 <code>FFTW_MEASURE</code>) using the &lsquo;<samp><code>|</code></samp>&rsquo; operator; in Fortran
cannam@127 97 you should just use &lsquo;<samp><code>+</code></samp>&rsquo;. (Take care not to add in the
cannam@127 98 same flag more than once, though. Alternatively, you can use the
cannam@127 99 <code>ior</code> intrinsic function standardized in Fortran 95.)
cannam@127 100 </p>
cannam@127 101
cannam@127 102
cannam@127 103
cannam@127 104 </body>
cannam@127 105 </html>