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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000 (2013-03-20)
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Chris@10 48 <a name="Advanced-Real-to-real-Transforms"></a>
Chris@10 49 <a name="Advanced-Real_002dto_002dreal-Transforms"></a>
Chris@10 50 <p>
Chris@10 51 Previous:&nbsp;<a rel="previous" accesskey="p" href="Advanced-Real_002ddata-DFTs.html#Advanced-Real_002ddata-DFTs">Advanced Real-data DFTs</a>,
Chris@10 52 Up:&nbsp;<a rel="up" accesskey="u" href="Advanced-Interface.html#Advanced-Interface">Advanced Interface</a>
Chris@10 53 <hr>
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Chris@10 55
Chris@10 56 <h4 class="subsection">4.4.3 Advanced Real-to-real Transforms</h4>
Chris@10 57
Chris@10 58 <pre class="example"> fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
Chris@10 59 double *in, const int *inembed,
Chris@10 60 int istride, int idist,
Chris@10 61 double *out, const int *onembed,
Chris@10 62 int ostride, int odist,
Chris@10 63 const fftw_r2r_kind *kind, unsigned flags);
Chris@10 64 </pre>
Chris@10 65 <p><a name="index-fftw_005fplan_005fmany_005fr2r-238"></a>
Chris@10 66 Like <code>fftw_plan_many_dft</code>, this functions adds <code>howmany</code>,
Chris@10 67 <code>nembed</code>, <code>stride</code>, and <code>dist</code> parameters to the
Chris@10 68 <code>fftw_plan_r2r</code> function, but otherwise behave the same as the
Chris@10 69 basic interface. The interpretation of those additional parameters are
Chris@10 70 the same as for <code>fftw_plan_many_dft</code>. (Of course, the
Chris@10 71 <code>stride</code> and <code>dist</code> parameters are now in units of
Chris@10 72 <code>double</code>, not <code>fftw_complex</code>.)
Chris@10 73
Chris@10 74 <p>Arrays <code>n</code>, <code>inembed</code>, <code>onembed</code>, and <code>kind</code> are not
Chris@10 75 used after this function returns. You can safely free or reuse them.
Chris@10 76
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