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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