#include "petscmat.h" #include "petscksp.h" PetscErrorCode PETSCMAT_DLLEXPORT MatCreateSchurComplement(Mat A,Mat Ap,Mat B,Mat C,Mat D,Mat *N)Collective on Mat
Notes: The Schur complement is NOT actually formed! Rather this object performs the matrix-vector product by using the the formula for the Schur complement and a KSP solver to approximate the action of inv(A)
All four matrices must have the same MPI communicator
A and D must be square matrices
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