MatIncreaseOverlap

Given a set of submatrices indicated by index sets, replaces the index sets by larger ones that represent submatrices with additional overlap.

Synopsis

#include "petscmat.h" 
PetscErrorCode MatIncreaseOverlap(Mat mat, PetscInt n, IS is[], PetscInt ov)

Collective

Input Parameters

• mat - the matrix

• n - the number of index sets

• is - the array of index sets (these index sets will changed during the call)

• ov - the additional overlap requested

Options Database Key

• -mat_increase_overlap_scalable - use a scalable algorithm to compute the overlap (supported by MPIAIJ matrix)

Note

The computed overlap preserves the matrix block sizes when the blocks are square. That is: if a matrix nonzero for a given block would increase the overlap all columns associated with that block are included in the overlap regardless of whether each specific column would increase the overlap.

See Also

Matrices, Mat, PCASM, MatSetBlockSize(), MatIncreaseOverlapSplit(), MatCreateSubMatrices()

Level

developer

Location

src/mat/interface/matrix.c

Examples

src/ksp/ksp/tutorials/ex82.c

Implementations

MatIncreaseOverlap_MPIAIJ() in src/mat/impls/aij/mpi/mpiov.c
MatIncreaseOverlap_SeqAIJ() in src/mat/impls/aij/seq/aij.c
MatIncreaseOverlap_MPIBAIJ() in src/mat/impls/baij/mpi/baijov.c
MatIncreaseOverlap_SeqBAIJ() in src/mat/impls/baij/seq/baij2.c
MatIncreaseOverlap_Htool() in src/mat/impls/htool/htool.cxx
MatIncreaseOverlap_IS() in src/mat/impls/is/matis.c
MatIncreaseOverlap_Normal() in src/mat/impls/normal/normm.c
MatIncreaseOverlap_MPISBAIJ() in src/mat/impls/sbaij/mpi/sbaijov.c
MatIncreaseOverlap_SeqSBAIJ() in src/mat/impls/sbaij/seq/sbaij2.c

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