PETSc version 3.17.5

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 on Mat

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

-mat_increase_overlap_scalable

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

Developer Note

Any implementation must preserve block sizes. That is: if the row block size and the column block size of mat are equal to bs, then the output index sets must be compatible with bs.

Level

developer

MatIncreaseOverlap

Synopsis

Input Parameters

Options Database

Developer Note

See Also

Level

Location

Examples

Implementations