s="subsection">6.12.4 MPI Data Distribution Functions</h4>

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<p>As described above (see <a href="MPI-Data-Distribution.html#MPI-Data-Distribution">MPI Data Distribution</a>), in order to
allocate your arrays, <em>before</em> creating a plan, you must first
call one of the following routines to determine the required
allocation size and the portion of the array locally stored on a given
process.  The <code>MPI_Comm</code> communicator passed here must be
equivalent to 