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<br>
Alternately, assemble zeros in the corresponding rows and columns
with a 1 on the diagonal.<br>
-sg<br>
<br>
<div class="moz-cite-prefix">On 2/2/16 6:58 AM, Matthew Knepley
wrote:<br>
</div>
<blockquote
cite="mid:CAMYG4GmDSNTBrN9WLQPPzEtsZt6VfG=yNCdG2fKvurLTb7zqvw@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">On Tue, Feb 2, 2016 at 8:35 AM, Orxan
Shibliyev <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:orxan.shibli@gmail.com" target="_blank">orxan.shibli@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">After hole cutting my unstructured mesh has
some active and inactive/fringe cells. I solve equations
on active/computational/field cells only. Some of the
active cells are neighbors of inactive cells. If I
prepare petsc matrix including all cells then the solver
does not converge due unchanging values of inactive
cells. How can I tell Petsc not to solve for certain
rows? If I make all cells active then the solver
converge so I am sure that there is no problem related
to solver.</div>
</blockquote>
</div>
<br>
Leave them out of the matrix?</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra"> Matt<br clear="all">
<div><br>
</div>
-- <br>
<div class="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>
</div>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
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</pre>
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