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<p>Just like Manuel Colera Rico, I would like to begin with existing<br>
(sub)matrices and put them directly into a matnest.<br>
<br>
You seem to have understood that problem from the archive 2.5<br>
years ago... If my memory is correct, it was an attempt to<br>
create a mat and switch between -mat_type nest and aij on the<br>
command line.<br>
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<p>Chris<br>
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<font style="font-family:Verdana;font-size:8pt;color:#7D7D7D;font-weight:bold;">dr. ir.</font><font style="font-family:Verdana;font-size:8pt;color:#7D7D7D;font-weight:bold;">
</font><font style="font-family: Verdana;font-size:8pt;color:#7D7D7D;font-weight:bold;">Christiaan</font><font style="font-family: Verdana;font-size:8pt;color:#7D7D7D;font-weight:bold;">
</font><font style="font-family:Verdana;font-size:8pt;color:#7D7D7D;font-weight:bold;">Klaij</font><font size="3" face="Segoe UI"></font><font style="font-family:Verdana;font-size:8pt;color:#7D7D7D;font-weight:bold;"> |
</font><font style="font-family:Verdana;font-size:8pt;color:#7D7D7D;font-weight:bold;">Senior Researcher</font><font style="font-family:Verdana;font-size:8pt;color:#7D7D7D;font-weight:bold;"> |
</font><font style="font-family:Verdana;font-size:8pt;color:#7D7D7D;font-weight:bold;">Research & Development</font><br>
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<div id="divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" face="Calibri, sans-serif" color="#000000"><b>From:</b> Matthew Knepley <knepley@gmail.com><br>
<b>Sent:</b> Thursday, April 11, 2019 2:16 PM<br>
<b>To:</b> Klaij, Christiaan<br>
<b>Cc:</b> petsc-users@mcs.anl.gov<br>
<b>Subject:</b> Re: [petsc-users] Error with KSPSetUp and MatNest</font>
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<div dir="ltr">On Thu, Apr 11, 2019 at 7:51 AM Klaij, Christiaan via petsc-users <<a href="mailto:petsc-users@mcs.anl.gov">petsc-users@mcs.anl.gov</a>> wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px solid rgb(204,204,204); padding-left:1ex">
Matt,<br>
<br>
As a happy MATNEST user, I got a bit worried when you wrote "we<br>
should remove MatCreateNest() completely". </blockquote>
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<div>This would not remove any of the Nest functionality, just the direct interface to it, which is the problem.</div>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px solid rgb(204,204,204); padding-left:1ex">
This happened last<br>
time I tried to use AIJ instead:<br>
<br>
<a href="https://lists.mcs.anl.gov/mailman/htdig/petsc-users/2016-August/029973.html" target="_blank">https://lists.mcs.anl.gov/mailman/htdig/petsc-users/2016-August/029973.html</a><br>
<br>
Has this problem been fixed in the meantime?<br>
</blockquote>
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<div>This looks like a problem with the Nest implementation, not AIJ? Maybe I am misunderstanding it.</div>
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<div> Thanks,</div>
<div><br>
</div>
<div> Matt</div>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px solid rgb(204,204,204); padding-left:1ex">
Chris<br>
<br>
> I think we should remove MatCreateNest() completely. We should have 1<br>
> mechanism for getting submatrices for creation, not 2, so we retain<br>
> MatCreateLocalRef(). Then if -mat_type nest was specified, it gives you<br>
> back an actually submatrix, otherwise it gives a view. This would do<br>
> everything that we currently do without this horrible MatNest interface<br>
> bubbling to the top.<br>
><br>
> Matt<br>
><br>
<br>
<br>
dr. ir. Christiaan Klaij | Senior Researcher | Research & Development<br>
MARIN | T +31 317 49 33 44 | mailto:<a href="mailto:C.Klaij@marin.nl" target="_blank">C.Klaij@marin.nl</a> |
<a href="http://www.marin.nl" target="_blank">http://www.marin.nl</a><br>
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MARIN news: <a href="http://www.marin.nl/web/News/News-items/42nd-FPSO-JIP-Week-April-812-Singapore.htm" target="_blank">
http://www.marin.nl/web/News/News-items/42nd-FPSO-JIP-Week-April-812-Singapore.htm</a><br>
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</blockquote>
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<div>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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<div><a href="http://www.cse.buffalo.edu/~knepley/" target="_blank">https://www.cse.buffalo.edu/~knepley/</a><br>
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