<div dir="ltr">On Fri, Apr 12, 2013 at 9:44 AM, Hui Zhang <span dir="ltr"><<a href="mailto:mike.hui.zhang@hotmail.com" target="_blank">mike.hui.zhang@hotmail.com</a>></span> wrote:<br><div class="gmail_extra"><div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Assembly of local Mat's to a parallel Mat formally defined by A = \sum_i Ri^T Ai Ri.<br>
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My Ai's are originally defined in sub-communicators. In Petsc, I was told before there are no counterpart of Ri that can promote the mat Ai to sup-communicator where A stays. (VecScatter can only acts on Vec but not Mat)<br>
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So, what is the easiest way to achieve this task? Note that Ai's are already defined in sub-communicators.<br>
</blockquote></div><br>What are you trying to do? Get the action of A, or assemble it directly?</div><div class="gmail_extra"><br></div><div class="gmail_extra"> Matt<br clear="all"><div><br></div>-- <br>What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead.<br>
-- Norbert Wiener
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