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.
See Also#
MATMPISBAIJ
, MatCreate()
, MatCreateSeqAIJ()
, MatSetValues()
, MatMPIAIJSetPreallocation()
, MatMPIAIJSetPreallocationCSR()
,
MPIAIJ
, MatCreateAIJ()
, MatCreateMPIAIJWithSplitArrays()
Level#
intermediate
Location#
src/mat/impls/sbaij/mpi/mpisbaij.c
Index of all Mat routines
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