Chris@10: Chris@10: Chris@10: FFTW Constants in Fortran - FFTW 3.3.3 Chris@10: Chris@10: Chris@10: Chris@10: Chris@10: Chris@10: Chris@10: Chris@10: Chris@10: Chris@10: Chris@10: Chris@10: Chris@10: Chris@10:
Chris@10: Chris@10:

Chris@10: Next: , Chris@10: Previous: Fortran-interface routines, Chris@10: Up: Calling FFTW from Legacy Fortran Chris@10:


Chris@10:
Chris@10: Chris@10:

8.2 FFTW Constants in Fortran

Chris@10: Chris@10:

When creating plans in FFTW, a number of constants are used to specify Chris@10: options, such as FFTW_MEASURE or FFTW_ESTIMATE. 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:

Instead, we have placed Fortran equivalents of the FFTW constant Chris@10: definitions in the file fftw3.f, which can be found in the same Chris@10: directory as fftw3.h. If your Fortran compiler supports a Chris@10: preprocessor of some sort, you should be able to include or Chris@10: #include this file; otherwise, you can paste it directly into Chris@10: your code. Chris@10: Chris@10:

In C, you combine different flags (like FFTW_PRESERVE_INPUT and Chris@10: FFTW_MEASURE) using the ‘|’ operator; in Fortran Chris@10: you should just use ‘+’. (Take care not to add in the Chris@10: same flag more than once, though. Alternatively, you can use the Chris@10: ior intrinsic function standardized in Fortran 95.) Chris@10: Chris@10: Chris@10: Chris@10: