[petsc-users] MatGetLocalSubMatrix?

Mark Adams mfadams at lbl.gov
Sat Jul 18 12:49:06 CDT 2015


I have a 4x4 block matrix, in one big AIJ matrix.  I use (global) ISs to
address individual fields.  I have a mass matrix for one field.  I would
like to add a scaled mass matrix to one field at a time.

MatGetLocalSubMatrix looks like what I want but it takes local indices.  My
ISs are global.  It seems like I should be able to do this without making a
local IS (shift the IS by the first equation index for the process).  Am I
missing something?

Mark
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20150718/ea6048f9/attachment.html>


More information about the petsc-users mailing list