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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,
Chris@42:                              double *in, const int *inembed,
Chris@42:                              int istride, int idist,
Chris@42:                              double *out, const int *onembed,
Chris@42:                              int ostride, int odist,
Chris@42:                              const fftw_r2r_kind *kind, unsigned flags);
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Like fftw_plan_many_dft, this functions adds howmany, Chris@42: nembed, stride, and dist parameters to the Chris@42: fftw_plan_r2r function, but otherwise behave the same as the Chris@42: basic interface. The interpretation of those additional parameters are Chris@42: the same as for fftw_plan_many_dft. (Of course, the Chris@42: stride and dist parameters are now in units of Chris@42: double, not fftw_complex.) Chris@42:

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Arrays n, inembed, onembed, and kind are not Chris@42: used after this function returns. You can safely free or reuse them. Chris@42:

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