Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: FFTW 3.3.5: Defining an FFTW module Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42: Chris@42:
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7.7 Defining an FFTW module

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Rather than using the include statement to include the Chris@42: fftw3.f03 interface file in any subroutine where you want to Chris@42: use FFTW, you might prefer to define an FFTW Fortran module. FFTW Chris@42: does not install itself as a module, primarily because Chris@42: fftw3.f03 can be shared between different Fortran compilers while Chris@42: modules (in general) cannot. However, it is trivial to define your Chris@42: own FFTW module if you want. Just create a file containing: Chris@42:

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  module FFTW3
Chris@42:     use, intrinsic :: iso_c_binding
Chris@42:     include 'fftw3.f03'
Chris@42:   end module
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Compile this file into a module as usual for your compiler (e.g. with Chris@42: gfortran -c you will get a file fftw3.mod). Now, Chris@42: instead of include 'fftw3.f03', whenever you want to use FFTW Chris@42: routines you can just do: Chris@42:

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  use FFTW3
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as usual for Fortran modules. (You still need to link to the FFTW Chris@42: library, of course.) Chris@42:

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