<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>
<p><span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"Times New Roman",serif">Hi,</span></span></span></span></span></p>
<p> </p>
<p><span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"Times New Roman",serif">I have a question regarding MatMatMult for MPIDENSE matrices. I have two dense matrices A and B for which I set the number up the number of local rows each processor owns manually (same for A and B) when creating them with MatCreateDense (which is different from what PETSC_DECIDE what do). When I calculate A*B=C using MatMatMult with MAT_INITIAL_MATRIX the resulting matrix C has a different distribution of the rows among the processes. Is this normal? I would have expected that C inherits the local row structure from A and B. </span></span><span style="font-size:12.0pt"><span style="font-family:"Yu Mincho",serif">Later</span></span><span style="font-size:12.0pt"><span style="font-family:"Times New Roman",serif"> on, I want to multiply C let’s say with A which gives then accordingly an error that the local size is not conform. </span></span></span></span></span></p>
<p><span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"Times New Roman",serif">If on the other hand A is MATMPIAIJ then C has the same local row structure.</span></span></span></span></span></p>
<p> </p>
<p><span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"Times New Roman",serif">Best,</span></span></span></span></span></p>
<p><span style="font-size:11pt"><span style="line-height:normal"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span style="font-family:"Times New Roman",serif">Marius</span></span></span></span></span></p>
</div></div></body></html>