exact MPI-based matrix using MatGetSubMatrix()

[Yujie]

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

A=

     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.

Regards,

Yujie
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