exact MPI-based matrix using MatGetSubMatrix()

Yujie recrusader at gmail.com
Tue Dec 23 18:49:12 CST 2008

Hi, PETSc Developer

Now, I have two matrices, A and B. A (its dimension is 2N*2N) is MPIDense
format. B (N*N) is MPIAIJ.

I want to exact four matrices from A, like this

     A11 A12


     A21 A22

each submatrices is multplied by B. My question is if A11, A12, A21, A22
have same distribution with B, how to do it with MatGetSubMatrix()?

Thanks a lot.


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