MatCreateSchurComplementPmat#

Synopsis#

#include "petscksp.h" 
PetscErrorCode MatCreateSchurComplementPmat(Mat A00, Mat A01, Mat A10, Mat A11, MatSchurComplementAinvType ainvtype, MatReuse preuse, Mat *Sp)

Collective

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 constructing a preconditioner for the true Schur complement $S = A11 - A10 inv(A00) A01$

See Also#

KSP: Linear System Solvers, MatCreateSchurComplement(), MatGetSchurComplement(), MatSchurComplementGetPmat(), MatSchurComplementAinvType

Level#

advanced

Location#

src/ksp/ksp/utils/schurm/schurm.c

Index of all KSP routines
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Index of all manual pages