DMPlexPreallocateOperator

Calculate the matrix nonzero pattern based upon the information in the DM, the PetscDS it contains, and the default PetscSection.

Synopsis

#include "petscdmplex.h"   
PetscErrorCode DMPlexPreallocateOperator(DM dm, PetscInt bs, PetscInt dnz[], PetscInt onz[], PetscInt dnzu[], PetscInt onzu[], Mat A, PetscBool fillMatrix)

Collective

Input Parameters

• dm - The DMPLEX

• bs - The matrix blocksize

• dnz - An array to hold the number of nonzeros in the diagonal block

• onz - An array to hold the number of nonzeros in the off-diagonal block

• dnzu - An array to hold the number of nonzeros in the upper triangle of the diagonal block

• onzu - An array to hold the number of nonzeros in the upper triangle of the off-diagonal block

• fillMatrix - If PETSC_TRUE, fill the matrix with zeros

Output Parameter

• A - The preallocated matrix

See Also

DMPlex: Unstructured Grids, DM, DMPLEX, DMCreateMatrix()

Level

advanced

Location

src/dm/impls/plex/plexpreallocate.c

Implementations

DMPlexPreallocateOperator_2() in src/dm/impls/plex/plexpreallocate.c

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