PETSc version 3.17.5

MatSchurComplementSetAinvType

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

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

Not collective.

	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, or MAT_SCHUR_COMPLEMENT_AINV_BLOCK_DIAG

-mat_schur_complement_ainv_type diag | lump | blockdiag

advanced