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fftw3: Calling FFTW from Legacy Fortran

 
 8 Calling FFTW from Legacy Fortran
 **********************************
 
 This chapter describes the interface to FFTW callable by Fortran code in
 older compilers not supporting the Fortran 2003 C interoperability
 features (Calling FFTW from Modern Fortran).  This interface has
 the major disadvantage that it is not type-checked, so if you mistake
 the argument types or ordering then your program will not have any
 compiler errors, and will likely crash at runtime.  So, greater care is
 needed.  Also, technically interfacing older Fortran versions to C is
 nonstandard, but in practice we have found that the techniques used in
 this chapter have worked with all known Fortran compilers for many
 years.
 
    The legacy Fortran interface differs from the C interface only in the
 prefix ('dfftw_' instead of 'fftw_' in double precision) and a few other
 minor details.  This Fortran interface is included in the FFTW libraries
 by default, unless a Fortran compiler isn't found on your system or
 '--disable-fortran' is included in the 'configure' flags.  We assume
 here that the reader is already familiar with the usage of FFTW in C, as
 described elsewhere in this manual.
 
    The MPI parallel interface to FFTW is _not_ currently available to
 legacy Fortran.
 

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· Fortran-interface routines
· FFTW Constants in Fortran
· FFTW Execution in Fortran
· Fortran Examples
· Wisdom of Fortran?
 

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