MatSchurComplementGetKSP

Gets the KSP object that is used to solve with A00 in the Schur complement matrix S = A11 - A10 ksp(A00,Ap00) A01

Synopsis

#include "petscksp.h" 
PetscErrorCode MatSchurComplementGetKSP(Mat S, KSP *ksp)

Not Collective

Input Parameter

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

Output Parameter

• ksp - the linear solver object

Options Database Key

• -fieldsplit_<splitname_0>_XXX - sets KSP and PC options for the 0-split solver inside the Schur complement used in PCFIELDSPLIT; default <splitname_0> is 0.

See Also

KSP: Linear System Solvers, Mat, MatSchurComplementSetKSP(), MatCreateSchurComplement(), MatCreateNormal(), MatMult(), MatCreate()

Level

intermediate

Location

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

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Index of all KSP routines
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Index of all manual pages