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
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