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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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+<head>
+<title>FFTW Constants in Fortran - FFTW 3.3.3</title>
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+<a name="FFTW-Constants-in-Fortran"></a>
+<p>
+Next:&nbsp;<a rel="next" accesskey="n" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran">FFTW Execution in Fortran</a>,
+Previous:&nbsp;<a rel="previous" accesskey="p" href="Fortran_002dinterface-routines.html#Fortran_002dinterface-routines">Fortran-interface routines</a>,
+Up:&nbsp;<a rel="up" accesskey="u" href="Calling-FFTW-from-Legacy-Fortran.html#Calling-FFTW-from-Legacy-Fortran">Calling FFTW from Legacy Fortran</a>
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+
+<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't be incorporated
+directly into Fortran code.
+
+   <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-583"></a>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.)
+
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