MatCreateMPIAIJWithArrays

creates a MPI AIJ matrix using arrays that contain in standard CSR format the local rows.

Synopsis

#include "petscmat.h" 
PetscErrorCode PETSCMAT_DLLEXPORT MatCreateMPIAIJWithArrays(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt M,PetscInt N,const PetscInt i[],const PetscInt j[],const PetscScalar a[],Mat *mat)

Collective on MPI_Comm

Input Parameters

	comm	- MPI communicator
	m	- number of local rows (Cannot be PETSC_DECIDE)
	n	- This value should be the same as the local size used in creating the x vector for the matrix-vector product y = Ax. (or PETSC_DECIDE to have calculated if N is given) For square matrices n is almost always m.
	M	- number of global rows (or PETSC_DETERMINE to have calculated if m is given)
	N	- number of global columns (or PETSC_DETERMINE to have calculated if n is given)
	i	- row indices
	j	- column indices
	a	- matrix values

Output Parameter

mat -the matrix

Notes

The i, j, and a arrays ARE copied by this routine into the internal format used by PETSc; thus you CANNOT change the matrix entries by changing the values of a[] after you have called this routine. Use MatCreateMPIAIJWithSplitArrays() to avoid needing to copy the arrays.

The i and j indices are 0 based

Keywords