FFTW 3.3.8: Guru Real-to-real Transforms

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4.5.5 Guru Real-to-real Transforms

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fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
Chris@82:                              int howmany_rank,
Chris@82:                              const fftw_iodim *howmany_dims,
Chris@82:                              double *in, double *out,
Chris@82:                              const fftw_r2r_kind *kind,
Chris@82:                              unsigned flags);
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Plan a real-to-real (r2r) multi-dimensional FFTW_FORWARD Chris@82: transform with transform dimensions given by (rank, dims) Chris@82: over a multi-dimensional vector (loop) of dimensions Chris@82: (howmany_rank, howmany_dims). dims and Chris@82: howmany_dims should point to fftw_iodim arrays of length Chris@82: rank and howmany_rank, respectively. Chris@82:

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The transform kind of each dimension is given by the kind Chris@82: parameter, which should point to an array of length rank. Valid Chris@82: fftw_r2r_kind constants are given in Real-to-Real Transform Kinds. Chris@82:

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in and out point to the real input and output arrays; they Chris@82: may be the same, indicating an in-place transform. Chris@82:

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flags is a bitwise OR (‘|’) of zero or more planner flags, Chris@82: as defined in Planner Flags. Chris@82:

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