petsc-dev 2014-07-31
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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
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages