petsc-3.11.4 2019-09-28

PCASMCreateSubdomains

Creates the index sets for the overlapping Schwarz preconditioner for a any problem on a general grid.

#include "petscpc.h" 
PetscErrorCode  PCASMCreateSubdomains(Mat A, PetscInt n, IS* outis[])

Collective

	A	- The global matrix operator
	n	- the number of local blocks

outis -the array of index sets defining the subdomains

Note: this generates nonoverlapping subdomains; the PCASM will generate the overlap from these if you use PCASMSetLocalSubdomains()

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

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

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