PCASMCreateSubdomains2D#

Creates the index sets for the overlapping Schwarz preconditioner, PCASM, for a two-dimensional problem on a regular grid.

Synopsis#

#include "petscpc.h" 
PetscErrorCode PCASMCreateSubdomains2D(PetscInt m, PetscInt n, PetscInt M, PetscInt N, PetscInt dof, PetscInt overlap, PetscInt *Nsub, IS *is[], IS *is_local[])

Not Collective

Input Parameters#

m - the number of mesh points in the x direction
n - the number of mesh points in the y direction
M - the number of subdomains in the x direction
N - the number of subdomains in the y direction
dof - degrees of freedom per node
overlap - overlap in mesh lines

Output Parameters#

Nsub - the number of subdomains created
is - array of index sets defining overlapping (if overlap > 0) subdomains
is_local - array of index sets defining non-overlapping subdomains

Note#

Presently PCAMSCreateSubdomains2d() is valid only for sequential preconditioners. More general related routines are PCASMSetTotalSubdomains() and PCASMSetLocalSubdomains().

Fortran Note#

Both is and is_local are created, so neither can be PETSC_NULL_IS_POINTER.

Level#

advanced

Location#

src/ksp/pc/impls/asm/asm.c

Examples#

src/ksp/ksp/tutorials/ex8.c
src/ksp/ksp/tests/ex71f.F90
src/ksp/pc/tests/ex10f.F90
src/ksp/pc/tests/ex6.c

Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages