<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Thu, Jun 2, 2016 at 5:11 PM, Luc Berger-Vergiat <span dir="ltr"><<a href="mailto:lb2653@columbia.edu" target="_blank">lb2653@columbia.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi all,<br>
I would like a quick clarification on what is and is_local are representing in the PCASMSetLocalSubdomains().<br>
My understanding is that if I have two mpi ranks and four subdomains I can end up having four blocks that I can denote as follows:<br>
<br>
| domain1 | domain2 | domain3 | domain3 |<br>
rank1 | block11 | block12 | block13 | |<br>
rank2 | block21 | block22 | -- | block24 |<br>
<br>
to each blockIJ I associate isIJ.<br>
<br>
So for rank1 I will have is=[1,2,3] and is_local=[is11,is12,is13], and for rank2 I will have is=[1,2,4] and is_local=[is21,is22,is24].<br>
Or am I not understanding things correctly?</blockquote><div><br></div><div>I did not understand the above.</div><div><br></div><div>The best way to think of this is algebraically. Suppose you have a matrix A, and you divide the rows into k disjoint sets where each</div><div>process gets one set. Then is_local on each process is a list of the rows in that set. Now we also allow some overlap, which means</div><div>rows in other sets are also used. The is on each process contains both is_local and these extra rows from other sets.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="HOEnZb"><font color="#888888"><br>
-- <br>
Best,<br>
Luc<br>
<br>
<br>
</font></span></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature">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</div>
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