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Chris@10: <h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
Chris@10:
Chris@10: <pre class="example"> fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
Chris@10: int howmany_rank,
Chris@10: const fftw_iodim *howmany_dims,
Chris@10: double *in, double *out,
Chris@10: const fftw_r2r_kind *kind,
Chris@10: unsigned flags);
Chris@10: </pre>
Chris@10: <p><a name="index-fftw_005fplan_005fguru_005fr2r-258"></a>
Chris@10: Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
Chris@10: transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
Chris@10: over a multi-dimensional vector (loop) of dimensions
Chris@10: (<code>howmany_rank</code>, <code>howmany_dims</code>). <code>dims</code> and
Chris@10: <code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
Chris@10: <code>rank</code> and <code>howmany_rank</code>, respectively.
Chris@10:
Chris@10: <p>The transform kind of each dimension is given by the <code>kind</code>
Chris@10: parameter, which should point to an array of length <code>rank</code>. Valid
Chris@10: <code>fftw_r2r_kind</code> constants are given in <a href="Real_002dto_002dReal-Transform-Kinds.html#Real_002dto_002dReal-Transform-Kinds">Real-to-Real Transform Kinds</a>.
Chris@10:
Chris@10: <p><code>in</code> and <code>out</code> point to the real input and output arrays; they
Chris@10: may be the same, indicating an in-place transform.
Chris@10:
Chris@10: <p><a name="index-flags-259"></a><code>flags</code> is a bitwise OR (‘<samp><span class="samp">|</span></samp>’) of zero or more planner flags,
Chris@10: as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
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