<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Hi,</div>
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<div><span style="font-size:11pt"><span style="line-height:107%"><span style="font-family:Calibri,sans-serif">Ok thanks for clarifying. </span></span></span></div>
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<div><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;">It seems to work for the other mattypes at least with the lastest 3.18 version. I think i had the problem with come older version, but i can't remember the version number.</span></font></div>
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<div><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;">best and thanks,</span></font></div>
<div><font face="Calibri, sans-serif"><span style="font-size: 14.6667px;">marius</span></font></div>
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<div style="margin:0 0 10px 0;"><b>Gesendet:</b> Freitag, 13. Januar 2023 um 17:25 Uhr<br/>
<b>Von:</b> "Pierre Jolivet" <pierre@joliv.et><br/>
<b>An:</b> "Marius Buerkle" <mbuerkle@web.de><br/>
<b>Cc:</b> petsc-users@mcs.anl.gov<br/>
<b>Betreff:</b> Re: [petsc-users] MatConvert changes distribution of local rows</div>
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<div>On 13 Jan 2023, at 9:18 AM, Marius Buerkle <mbuerkle@web.de> wrote:</div>
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<div>Matrix types is from MATMPIDENSE to MATSCALAPACK,</div>
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<div>OK, that’s not possible, because PETSc and ScaLAPACK use different distributions for dense matrices.</div>
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<div>but I think it happens also for other matrix types IIRC.</div>
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<div>Which one?</div>
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<div>Thanks,</div>
<div>Pierre</div>
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<div style="margin: 0 0 10.0px 0;"><b>Gesendet:</b> Freitag, 13. Januar 2023 um 16:58 Uhr<br/>
<b>Von:</b> "Pierre Jolivet" <pierre@joliv.et><br/>
<b>An:</b> "Marius Buerkle" <mbuerkle@web.de><br/>
<b>Cc:</b> petsc-users@mcs.anl.gov<br/>
<b>Betreff:</b> Re: [petsc-users] MatConvert changes distribution of local rows</div>
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<div>On 13 Jan 2023, at 8:49 AM, Marius Buerkle <mbuerkle@web.de> wrote:</div>
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<div>Hi,</div>
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<div>I have a matrix A for which I defined the number of local rows per process manually using MatSetSizes. When I use MatConvert to change the matrix type it changes the number of local rows (to what one would get if MatSetSize is called with PETSC_DECIDE for number of local rows), which causes problems when doing MatVec producs and stuff like that. Is there any way to preserve the the number of local rows when using MatConvert?</div>
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<div>This is most likely a bug, it’s not handled properly in some MatConvert() implementations.</div>
<div>Could you please share either the matrix types or a minimal working example?</div>
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<div>Thanks,</div>
<div>Pierre</div>
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<div>Best,</div>
<div>Marius</div>
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