petsc-3.14.6 2021-03-30

PCGASMGetSubdomains

Gets the subdomains supported on this processor for the additive Schwarz preconditioner.

#include "petscpc.h" 
PetscErrorCode  PCGASMGetSubdomains(PC pc,PetscInt *n,IS *iis[],IS *ois[])

Not Collective

- the preconditioner context

	n	- the number of subdomains for this processor (default value = 1)
	iis	- the index sets that define the inner subdomains (without overlap) supported on this processor (can be NULL)
	ois	- the index sets that define the outer subdomains (with overlap) supported on this processor (can be NULL)

The user is responsible for destroying the ISs and freeing the returned arrays. The IS numbering is in the parallel, global numbering of the vector.

advanced