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Add FFTW3
author Chris Cannam
date Wed, 20 Mar 2013 15:35:50 +0000
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+<html lang="en">
+<head>
+<title>Advanced distributed-transpose interface - FFTW 3.3.3</title>
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+<a name="Advanced-distributed-transpose-interface"></a>
+<a name="Advanced-distributed_002dtranspose-interface"></a>
+<p>
+Next:&nbsp;<a rel="next" accesskey="n" href="An-improved-replacement-for-MPI_005fAlltoall.html#An-improved-replacement-for-MPI_005fAlltoall">An improved replacement for MPI_Alltoall</a>,
+Previous:&nbsp;<a rel="previous" accesskey="p" href="Basic-distributed_002dtranspose-interface.html#Basic-distributed_002dtranspose-interface">Basic distributed-transpose interface</a>,
+Up:&nbsp;<a rel="up" accesskey="u" href="FFTW-MPI-Transposes.html#FFTW-MPI-Transposes">FFTW MPI Transposes</a>
+<hr>
+</div>
+
+<h4 class="subsection">6.7.2 Advanced distributed-transpose interface</h4>
+
+<p>The above routines are for a transpose of a matrix of numbers (of type
+<code>double</code>), using FFTW's default block sizes.  More generally, one
+can perform transposes of <em>tuples</em> of numbers, with
+user-specified block sizes for the input and output:
+
+<pre class="example">     fftw_plan fftw_mpi_plan_many_transpose
+                     (ptrdiff_t n0, ptrdiff_t n1, ptrdiff_t howmany,
+                      ptrdiff_t block0, ptrdiff_t block1,
+                      double *in, double *out, MPI_Comm comm, unsigned flags);
+</pre>
+   <p><a name="index-fftw_005fmpi_005fplan_005fmany_005ftranspose-403"></a>
+In this case, one is transposing an <code>n0</code> by <code>n1</code> matrix of
+<code>howmany</code>-tuples (e.g. <code>howmany = 2</code> for complex numbers). 
+The input is distributed along the <code>n0</code> dimension with block size
+<code>block0</code>, and the <code>n1</code> by <code>n0</code> output is distributed
+along the <code>n1</code> dimension with block size <code>block1</code>.  If
+<code>FFTW_MPI_DEFAULT_BLOCK</code> (0) is passed for a block size then FFTW
+uses its default block size.  To get the local size of the data on
+each process, you should then call <code>fftw_mpi_local_size_many_transposed</code>. 
+<a name="index-FFTW_005fMPI_005fDEFAULT_005fBLOCK-404"></a><a name="index-fftw_005fmpi_005flocal_005fsize_005fmany_005ftransposed-405"></a>
+
+   </body></html>
+