PCModifySubMatrices#
Calls an optional user-defined routine within certain preconditioners if one has been set with PCSetModifySubMatrices().
Synopsis#
#include "petscksp.h"
PetscErrorCode PCModifySubMatrices(PC pc, PetscInt nsub, const IS row[], const IS col[], Mat submat[], void *ctx)
Collective
Input Parameters#
pc - the preconditioner context
nsub - the number of local submatrices
row - an array of index sets that contain the global row numbers that comprise each local submatrix
col - an array of index sets that contain the global column numbers that comprise each local submatrix
submat - array of local submatrices
ctx - optional user-defined context for private data for the user-defined routine (may be
NULL)
Output Parameter#
submat - array of local submatrices (the entries of which may have been modified)
Note#
The user should NOT generally call this routine, as it will automatically be called within certain preconditioners.
See Also#
Level#
developer
Location#
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages