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Chris@10: <h3 class="section">8.2 FFTW Constants in Fortran</h3>
Chris@10:
Chris@10: <p>When creating plans in FFTW, a number of constants are used to specify
Chris@10: options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
Chris@10: same constants must be used with the wrapper routines, but of course the
Chris@10: C header files where the constants are defined can't be incorporated
Chris@10: directly into Fortran code.
Chris@10:
Chris@10: <p>Instead, we have placed Fortran equivalents of the FFTW constant
Chris@10: definitions in the file <code>fftw3.f</code>, which can be found in the same
Chris@10: directory as <code>fftw3.h</code>. If your Fortran compiler supports a
Chris@10: preprocessor of some sort, you should be able to <code>include</code> or
Chris@10: <code>#include</code> this file; otherwise, you can paste it directly into
Chris@10: your code.
Chris@10:
Chris@10: <p><a name="index-flags-583"></a>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
Chris@10: <code>FFTW_MEASURE</code>) using the ‘<samp><code>|</code></samp>’ operator; in Fortran
Chris@10: you should just use ‘<samp><code>+</code></samp>’. (Take care not to add in the
Chris@10: same flag more than once, though. Alternatively, you can use the
Chris@10: <code>ior</code> intrinsic function standardized in Fortran 95.)
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