how to get the MPIAIJ matrix information?

[Yujie]

Hi,

In MatCreateMPIAIJ() function, it needs d_nz, d_nnz[], o_nz, o_nnz[]. If one
has a MATAIJ matrix, how to obtian this information? thanks a lot.

PetscErrorCode PETSCMAT_DLLEXPORT MatCreateMPIAIJ(MPI_Comm comm,PetscInt
m,PetscInt n,PetscInt M,PetscInt N,PetscInt d_nz,const PetscInt
d_nnz[],PetscInt o_nz,const PetscInt o_nnz[],Mat *A)

Regards,

Yujie
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