"sec-1"><span class="section-number-2">1</span> Introduction</h2>
<div class="outline-text-2" id="text-1">
<p>
This file implements functionality to change the MPI parallel distribution
of a sparse matrix stored in the modified block-compressed form used
in Siesta.
</p>

<p>
The immediate goal is to exchange matrices between Siesta and the
PEXSI library. Siesta uses a "block-cyclic" distribution over
N<sub>Siesta</sub> processors, and PEXSI uses a simple "greedy" blocked
distribution on each pole-group, wit