petsc-3.7.5 2017-01-01

MatSetBlockSize

Sets the matrix block size.

#include "petscmat.h" 
PetscErrorCode MatSetBlockSize(Mat mat,PetscInt bs)

Logically Collective on Mat

	mat	- the matrix
	bs	- block size

Block row formats are MATSEQBAIJ, MATMPIBAIJ, MATSEQSBAIJ, MATMPISBAIJ. These formats ALWAYS have square block storage in the matrix.

This must be called before MatSetUp() or MatXXXSetPreallocation() (or will default to 1) and the block size cannot be changed later