petsc-3.4.5 2014-06-29

PCGASMCreateLocalSubdomains

Creates n local index sets for the overlapping Schwarz preconditioner for a any problem based on its matrix.

#include "petscpc.h" 
PetscErrorCode  PCGASMCreateLocalSubdomains(Mat A, PetscInt overlap, PetscInt n, IS *iis[], IS *ois[])

Collective

	A	- The global matrix operator
	overlap	- amount of overlap in outer subdomains
	n	- the number of local subdomains

	iis	- the array of index sets defining the local inner subdomains (on which the correction is applied)
	ois	- the array of index sets defining the local outer subdomains (on which the residual is computed)

Note: this generates n nonoverlapping local inner subdomains on PETSC_COMM_SELF; PCGASM will generate the overlap from these if you use them in PCGASMSetSubdomains() and set a nonzero overlap with PCGASMSetOverlap()

In the Fortran version you must provide the array outis[] already allocated of length n.

PC, GASM, additive Schwarz, create, subdomains, unstructured grid