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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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author	Chris Cannam
date	Wed, 20 Mar 2013 15:35:50 +0000
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