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When creating plans in FFTW, a number of constants are used to specify
d@0: options, such as FFTW_MEASURE or FFTW_ESTIMATE. The
d@0: same constants must be used with the wrapper routines, but of course the
d@0: C header files where the constants are defined can't be incorporated
d@0: directly into Fortran code.
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Instead, we have placed Fortran equivalents of the FFTW constant
d@0: definitions in the file fftw3.f, which can be found in the same
d@0: directory as fftw3.h. If your Fortran compiler supports a
d@0: preprocessor of some sort, you should be able to include or
d@0: #include this file; otherwise, you can paste it directly into
d@0: your code.
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In C, you combine different flags (like FFTW_PRESERVE_INPUT and
d@0: FFTW_MEASURE) using the `|' operator; in Fortran you
d@0: should just use `+'. (Take care not to add in the same flag
d@0: more than once, though.)
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