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author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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3 <title>FFTW Constants in Fortran - FFTW 3.3.3</title>
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51 Next:&nbsp;<a rel="next" accesskey="n" href="FFTW-Execution-in-Fortran.html#FFTW-Execution-in-Fortran">FFTW Execution in Fortran</a>,
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56
57 <h3 class="section">8.2 FFTW Constants in Fortran</h3>
58
59 <p>When creating plans in FFTW, a number of constants are used to specify
60 options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
61 same constants must be used with the wrapper routines, but of course the
62 C header files where the constants are defined can't be incorporated
63 directly into Fortran code.
64
65 <p>Instead, we have placed Fortran equivalents of the FFTW constant
66 definitions in the file <code>fftw3.f</code>, which can be found in the same
67 directory as <code>fftw3.h</code>. If your Fortran compiler supports a
68 preprocessor of some sort, you should be able to <code>include</code> or
69 <code>#include</code> this file; otherwise, you can paste it directly into
70 your code.
71
72 <p><a name="index-flags-583"></a>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
73 <code>FFTW_MEASURE</code>) using the &lsquo;<samp><code>|</code></samp>&rsquo; operator; in Fortran
74 you should just use &lsquo;<samp><code>+</code></samp>&rsquo;. (Take care not to add in the
75 same flag more than once, though. Alternatively, you can use the
76 <code>ior</code> intrinsic function standardized in Fortran 95.)
77
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