petsc-3.8.4 2018-03-24
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PCASMGetLocalSubmatrices

 Gets the local submatrices (for this processor only) for the additive Schwarz preconditioner.

Synopsis

#include "petscpc.h" 
PetscErrorCode  PCASMGetLocalSubmatrices(PC pc,PetscInt *n,Mat *mat[])
Not Collective

Input Parameter

pc -the preconditioner context

Output Parameters

n - the number of matrices for this processor (default value = 1)
mat - the matrices

Notes: Call after PCSetUp() (or KSPSetUp()) but before PCApply() (or KSPApply()) and before PCSetUpOnBlocks())

Usually one would use PCSetModifySubmatrices() to change the submatrices in building the preconditioner.

Keywords

PC, ASM, set, local, subdomains, additive Schwarz, block Jacobi

See Also

PCASMSetTotalSubdomains(), PCASMSetOverlap(), PCASMGetSubKSP(),
PCASMCreateSubdomains2D(), PCASMSetLocalSubdomains(), PCASMGetLocalSubdomains(), PCSetModifySubmatrices()

Level:advanced
Location:src/ksp/pc/impls/asm/asm.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages