petsc-3.3-p7 2013-05-11

MatSchurComplementUpdate

Updates the Schur complement matrix object with new submatrices

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

Collective on Mat

	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() though they need not be the same matrices