MatCreateMPISBAIJWithArrays#

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

Synopsis#

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

Collective

Input Parameters#

comm - MPI communicator
bs - the block size, only a block size of 1 is supported
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; that is i[0] = 0, i[row] = i[row-1] + number of block elements in that row block row of the matrix
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, and i indices are indices corresponding to the local j array.