PCFactorSetZeroPivot#

Sets the size at which smaller pivots are declared to be zero

Synopsis#

#include "petscpc.h" 
PetscErrorCode PCFactorSetZeroPivot(PC pc, PetscReal zero)

Logically Collective

Input Parameters#

  • pc - the preconditioner context

  • zero - all pivots smaller than this will be considered zero

Options Database Key#

  • -pc_factor_zeropivot - Sets tolerance for what is considered a zero pivot

See Also#

KSP: Linear System Solvers, PCCHOLESKY, PCLU, PCFactorSetShiftType(), PCFactorSetShiftAmount()

Level#

intermediate

Location#

src/ksp/pc/impls/factor/factor.c

Implementations#

PCFactorSetZeroPivot_Factor() in src/ksp/pc/impls/factor/factimpl.c


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