Hello, I am running a job on two processors and a matmpiaij. I want to set a submatrix of this on the one processor (rank==1). So I made Mat *localB; If(rank==1) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20110303/e4bed492/attachment.htm>