petsc-3.7.3 2016-08-01

MatCreateMPIAIJCRL

Creates a sparse matrix of type MPIAIJCRL. This type inherits from AIJ, but stores some additional information that is used to allow better vectorization of the matrix-vector product. At the cost of increased storage, the AIJ formatted matrix can be copied to a format in which pieces of the matrix are stored in ELLPACK format, allowing the vectorized matrix multiply routine to use stride-1 memory accesses. As with the AIJ type, it is important to preallocate matrix storage in order to get good assembly performance.

Synopsis

PetscErrorCode  MatCreateMPIAIJCRL(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt nz,const PetscInt nnz[],PetscInt onz,const PetscInt onnz[],Mat *A)

Collective on MPI_Comm

Input Parameters

	comm	- MPI communicator, set to PETSC_COMM_SELF
	m	- number of rows
	n	- number of columns
	nz	- number of nonzeros per row (same for all rows)
	nnz	- array containing the number of nonzeros in the various rows (possibly different for each row) or NULL

Output Parameter

A -the matrix

Notes

If nnz is given then nz is ignored

Keywords