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