petsc-3.12.5 2020-03-29
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 Arguments
| 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
|
Ouput Argument
A -The preallocated matrix
See Also
DMCreateMatrix()
Level
advanced
Location
src/dm/impls/plex/plexpreallocate.c
Implementations
DMPlexPreallocateOperator_2 in src/dm/impls/plex/plexpreallocate.c
Index of all DMPLEX routines
Table of Contents for all manual pages
Index of all manual pages