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cannam@127: <title>FFTW 3.3.5: FFTW Constants in Fortran</title>
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cannam@127: 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> [<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>
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cannam@127: <a name="FFTW-Constants-in-Fortran-1"></a>
cannam@127: <h3 class="section">8.2 FFTW Constants in Fortran</h3>
cannam@127:
cannam@127: <p>When creating plans in FFTW, a number of constants are used to specify
cannam@127: options, such as <code>FFTW_MEASURE</code> or <code>FFTW_ESTIMATE</code>. The
cannam@127: same constants must be used with the wrapper routines, but of course the
cannam@127: C header files where the constants are defined can’t be incorporated
cannam@127: directly into Fortran code.
cannam@127: </p>
cannam@127: <p>Instead, we have placed Fortran equivalents of the FFTW constant
cannam@127: definitions in the file <code>fftw3.f</code>, which can be found in the same
cannam@127: directory as <code>fftw3.h</code>. If your Fortran compiler supports a
cannam@127: preprocessor of some sort, you should be able to <code>include</code> or
cannam@127: <code>#include</code> this file; otherwise, you can paste it directly into
cannam@127: your code.
cannam@127: </p>
cannam@127: <a name="index-flags-9"></a>
cannam@127: <p>In C, you combine different flags (like <code>FFTW_PRESERVE_INPUT</code> and
cannam@127: <code>FFTW_MEASURE</code>) using the ‘<samp><code>|</code></samp>’ operator; in Fortran
cannam@127: you should just use ‘<samp><code>+</code></samp>’. (Take care not to add in the
cannam@127: same flag more than once, though. Alternatively, you can use the
cannam@127: <code>ior</code> intrinsic function standardized in Fortran 95.)
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