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fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims, Chris@19: int howmany_rank, Chris@19: const fftw_iodim *howmany_dims, Chris@19: double *in, double *out, Chris@19: const fftw_r2r_kind *kind, Chris@19: unsigned flags); Chris@19:Chris@19:
Chris@19: Plan a real-to-real (r2r) multi-dimensional FFTW_FORWARD
Chris@19: transform with transform dimensions given by (rank, dims)
Chris@19: over a multi-dimensional vector (loop) of dimensions
Chris@19: (howmany_rank, howmany_dims). dims and
Chris@19: howmany_dims should point to fftw_iodim arrays of length
Chris@19: rank and howmany_rank, respectively.
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The transform kind of each dimension is given by the kind
Chris@19: parameter, which should point to an array of length rank. Valid
Chris@19: fftw_r2r_kind constants are given in Real-to-Real Transform Kinds.
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in and out point to the real input and output arrays; they
Chris@19: may be the same, indicating an in-place transform.
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flags is a bitwise OR (‘|’) of zero or more planner flags,
Chris@19: as defined in Planner Flags.
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