MatCreateSchurComplementPmat#
create a preconditioning matrix for the Schur complement by explicitly assembling the sparse matrix Sp = A11 - A10 inv(DIAGFORM(A00)) A01
Synopsis#
#include "petscksp.h"
PetscErrorCode MatCreateSchurComplementPmat(Mat A00, Mat A01, Mat A10, Mat A11, MatSchurComplementAinvType ainvtype, MatReuse preuse, Mat *Sp)
Collective on A00
Input Parameters#
A00 - the upper-left part of the original matrix A = [A00 A01; A10 A11]
A01 - (optional) the upper-right part of the original matrix A = [A00 A01; A10 A11]
A10 - (optional) the lower-left part of the original matrix A = [A00 A01; A10 A11]
A11 - (optional) the lower-right part of the original matrix A = [A00 A01; A10 A11]
ainvtype - type of approximation for DIAGFORM(A00) used when forming Sp = A11 - A10 inv(DIAGFORM(A00)) A01. See MatSchurComplementAinvType.
preuse - MAT_INITIAL_MATRIX for a new Sp, or MAT_REUSE_MATRIX to reuse an existing Sp, or MAT_IGNORE_MATRIX to put nothing in Sp
Output Parameter#
Sp - approximate Schur complement suitable for preconditioning the true Schur complement S = A11 - A10 inv(A00) A01
See Also#
MatCreateSchurComplement()
, MatGetSchurComplement()
, MatSchurComplementGetPmat()
, MatSchurComplementAinvType
Level#
advanced
Location#
src/ksp/ksp/utils/schurm/schurm.c
Index of all KSP routines
Table of Contents for all manual pages
Index of all manual pages