petsc-3.7.7 2017-09-25

MatIncreaseOverlap

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

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

Collective on Mat

	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

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