petsc-3.9.4 2018-09-11
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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 on PC

Input Parameters

pc - the preconditioner context
zero - all pivots smaller than this will be considered zero

Options Database Key

-pc_factor_zeropivot <zero> -Sets tolerance for what is considered a zero pivot

Keywords

PC, set, factorization, direct, fill

See Also

PCFactorSetShiftType(), PCFactorSetShiftAmount()

Level

intermediate

Location

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

Implementations

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

Index of all PC routines
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Index of all manual pages