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<span id="FFTW-MPI-Transposes"></span><div class="header">
<p>
Next: <a href="FFTW-MPI-Wisdom.html" accesskey="n" rel="next">FFTW MPI Wisdom</a>, Previous: <a href="Other-Multi_002ddimensional-Real_002ddata-MPI-Transforms.html" accesskey="p" rel="prev">Other Multi-dimensional Real-data MPI Transforms</a>, Up: <a href="Distributed_002dmemory-FFTW-with-MPI.html" accesskey="u" rel="up">Distributed-memory FFTW with MPI</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
<span id="FFTW-MPI-Transposes-1"></span><h3 class="section">6.7 FFTW MPI Transposes</h3>
<span id="index-transpose-2"></span>
<p>The FFTW&rsquo;s MPI Fourier transforms rely on one or more <em>global
transposition</em> step for their communications. For example, the
multidimensional transforms work by transforming along some
dimensions, then transposing to make the first dimension local and
transforming that, then transposing back. Because global
transposition of a block-distributed matrix has many other potential
uses besides FFTs, FFTW&rsquo;s transpose routines can be called directly,
as documented in this section.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Basic-distributed_002dtranspose-interface.html" accesskey="1">Basic distributed-transpose interface</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Advanced-distributed_002dtranspose-interface.html" accesskey="2">Advanced distributed-transpose interface</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="An-improved-replacement-for-MPI_005fAlltoall.html" accesskey="3">An improved replacement for MPI_Alltoall</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
</table>
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