fftw3: Advanced Real-to-real Transforms
4.4.3 Advanced Real-to-real Transforms
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fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
double *in, const int *inembed,
int istride, int idist,
double *out, const int *onembed,
int ostride, int odist,
const fftw_r2r_kind *kind, unsigned flags);
Like 'fftw_plan_many_dft', this functions adds 'howmany', 'nembed',
'stride', and 'dist' parameters to the 'fftw_plan_r2r' function, but
otherwise behave the same as the basic interface. The interpretation of
those additional parameters are the same as for 'fftw_plan_many_dft'.
(Of course, the 'stride' and 'dist' parameters are now in units of
'double', not 'fftw_complex'.)
Arrays 'n', 'inembed', 'onembed', and 'kind' are not used after this
function returns. You can safely free or reuse them.
Info Catalog
fftw3: Advanced Real-data DFTs
fftw3: Advanced Interface