MatSchurComplementSetAinvType

set the type of approximation used for the inverse of the (0,0) block used in forming Sp in MatSchurComplementGetPmat()

Synopsis

#include "petscksp.h" 
PetscErrorCode MatSchurComplementSetAinvType(Mat S, MatSchurComplementAinvType ainvtype)

Not Collective

Input Parameters

• S - matrix obtained with MatCreateSchurComplement() (or equivalent) and implementing the action of A11 - A10 ksp(A00,Ap00) A01

• ainvtype - type of approximation to be used to form approximate Schur complement Sp = A11 - A10 inv(DIAGFORM(A00)) A01: MAT_SCHUR_COMPLEMENT_AINV_DIAG, MAT_SCHUR_COMPLEMENT_AINV_LUMP, MAT_SCHUR_COMPLEMENT_AINV_BLOCK_DIAG, or MAT_SCHUR_COMPLEMENT_AINV_FULL

Options Database Key

• -mat_schur_complement_ainv_type diag | lump | blockdiag | full - set schur complement type

See Also

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

Level

advanced

Location

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

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