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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