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<div class="moz-cite-prefix">On 07/02/2013 01:41 PM, Matthew Knepley
wrote:<br>
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<div dir="ltr">On Tue, Jul 2, 2013 at 12:19 PM, Michael
Povolotskyi <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:mpovolot@purdue.edu" target="_blank">mpovolot@purdue.edu</a>></span>
wrote:<br>
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<div>On 07/02/2013 12:46 PM, Hong Zhang wrote:<br>
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<div class="gmail_extra">Michael :<br>
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0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Dear
Petsc developers,<br>
I'm gradually moving from the version 3.2 to
the version 3.4.<br>
I had to skip the version 3.3 because of the
bug in MatMatMult that has been reported to
you.<br>
<br>
What I see is that the MatMatMult works well
but there is a difference:<br>
in the version 3.2 if a sparse matrix was
multiplied by a dense matrix the result was
dense.<br>
In the version 3.4 the result is sparse.<br>
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<div> A sparse matrix multiplied by a dense
matrix results in a dense matrix for all petsc
versions.</div>
<div>What makes you conclude "In the version 3.4
the result is sparse"?</div>
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<div>Hong</div>
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I use MatMatMult with MAT_INITIAL_MATRIX<br>
Then I call MatGetType(A, &type) for the product
matrix<br>
Then I have an if statement:<br>
if (string(type) == "seqdense" || string(type) ==
"mpidense")</div>
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<div style="">What is the type? M->hdr.type_name</div>
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<div style=""> Matt</div>
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Looks like everything is fine, I could not reproduce the error any
more.<br>
Michael.<br>
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