PCDeflationSetCorrectionFactor

Set coarse problem correction factor. The preconditioner becomes PM^{-1} + factQ.

Synopsis

#include "petscksp.h" 
PetscErrorCode PCDeflationSetCorrectionFactor(PC pc, PetscScalar fact)

Logically Collective

Input Parameters

• pc - the preconditioner context

• fact - correction factor

Options Database Keys

• -pc_deflation_correction - if true apply coarse problem correction

• -pc_deflation_correction_factor <1.0> - sets coarse problem correction factor

Note

Any non-zero fact enables the coarse problem correction.

See Also

KSP: Linear System Solvers, PCDEFLATION, PCDeflationSetLevels(), PCDeflationSetReductionFactor()

Level

intermediate

Location

src/ksp/pc/impls/deflation/deflation.c

Implementations

PCDeflationSetCorrectionFactor_Deflation() in src/ksp/pc/impls/deflation/deflation.c

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