#include "petscksp.h" PetscErrorCode MatCreateSchurComplement(Mat A00,Mat Ap00,Mat A01,Mat A10,Mat A11,Mat *S)Collective on Mat Many br
A00,A01,A10,A11 | - the four parts of the original matrix A = [A00 A01; A10 A11] (A11 is optional) Many br | |
Ap00 | - preconditioning matrix for use in ksp(A00,Ap00) to approximate the action of A^{-1} Many br |
Many br
Notes: The Schur complement is NOT actually formed! Rather, this Many brobject performs the matrix-vector product by using formula S = A11 - A10 A^{-1} A01 Many brfor Schur complement S and a KSP solver to approximate the action of A^{-1}. Many br
All four matrices must have the same MPI communicator. Many br
A00 and A11 must be square matrices. Many br
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