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<h4 class="subsection">4.4.3 Advanced Real-to-real Transforms</h4>

<pre class="example">     fftw_plan fftw_plan_many_r2r(int rank, const int *n, int howmany,
                                  double *in, const int *inembed,
                                  int istride, int idist,
                                  double *out, const int *onembed,
                                  int ostride, int odist,
                                  const fftw_r2r_kind *kind, unsigned flags);
</pre>
   <p><a name="index-fftw_005fplan_005fmany_005fr2r-238"></a>
Like <code>fftw_plan_many_dft</code>, this functions adds <code>howmany</code>,
<code>nembed</code>, <code>stride</code>, and <code>dist</code> parameters to the
<code>fftw_plan_r2r</code> function, but otherwise behave the same as the
basic interface.  The interpretation of those additional parameters are
the same as for <code>fftw_plan_many_dft</code>.  (Of course, the
<code>stride</code> and <code>dist</code> parameters are now in units of
<code>double</code>, not <code>fftw_complex</code>.)

   <p>Arrays <code>n</code>, <code>inembed</code>, <code>onembed</code>, and <code>kind</code> are not
used after this function returns.  You can safely free or reuse them.

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author	Chris Cannam <cannam@all-day-breakfast.com>
date	Wed, 20 Mar 2013 15:35:50 +0000
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