#include "petscmat.h" PetscErrorCode MatCreateBlockMat(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt bs,PetscInt nz,PetscInt *nnz, Mat *A)Collective on MPI_Comm
|comm||- MPI communicator|
|m||- number of rows|
|n||- number of columns|
|bs||- size of each submatrix|
|nz||- expected maximum number of nonzero blocks in row (use PETSC_DEFAULT if not known)|
|nnz||- expected number of nonzers per block row if known (use NULL otherwise)|
Notes: Matrices of this type are nominally-sparse matrices in which each "entry" is a Mat object. Each Mat must have the same size and be sequential. The local and global sizes must be compatible with this decomposition.
For matrices containing parallel submatrices and variable block sizes, see MATNEST.