petsc-3.4.4 2014-03-13

MatSchurComplementUpdate

Updates the Schur complement matrix object with new submatrices

Synopsis

#include "petscksp.h" 
PetscErrorCode  MatSchurComplementUpdate(Mat N,Mat A,Mat Ap,Mat B,Mat C,Mat D,MatStructure str)
Collective on Mat

Input Parameters

N - the matrix obtained with MatCreateSchurComplement()
A,B,C,D - the four parts of the original matrix (D is optional)
str - either SAME_NONZERO_PATTERN,DIFFERENT_NONZERO_PATTERN,SAME_PRECONDITIONER

Notes: All four matrices must have the same MPI communicator

A and D must be square matrices

All of the matrices provided must have the same sizes as was used with MatCreateSchurComplement() or MatSchurComplementSet() though they need not be the same matrices

See Also

MatCreateNormal(), MatMult(), MatCreate(), MatSchurComplementGetKSP(), MatCreateSchurComplement()

Level:intermediate
Location:
src/ksp/ksp/utils/schurm.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages