petsc-3.3-p7 2013-05-11

PCFactorSetShiftAmount

adds a quantity to the diagonal of the matrix during numerical factorization, thus the matrix has nonzero pivots

Synopsis

#include "petscpc.h" 
PetscErrorCode  PCFactorSetShiftAmount(PC pc,PetscReal shiftamount)

Logically Collective on PC

Input Parameters

	pc	- the preconditioner context
	shiftamount	- amount of shift

Options Database Key

-pc_factor_shift_amount <shiftamount> -Sets shift amount or PETSC_DECIDE for the default

Keywords

PC, set, factorization,

See Also

PCFactorSetZeroPivot(), PCFactorSetShiftType()

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