petsc-3.7.5 2017-01-01

PCFactorSetShiftType

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

#include "petscpc.h" 
PetscErrorCode  PCFactorSetShiftType(PC pc,MatFactorShiftType shifttype)

Logically Collective on PC

	pc	- the preconditioner context
	shifttype	- type of shift; one of MAT_SHIFT_NONE, MAT_SHIFT_NONZERO, MAT_SHIFT_POSITIVE_DEFINITE, MAT_SHIFT_INBLOCKS

-pc_factor_shift_type <shifttype> -Sets shift type or PETSC_DECIDE for the default; use '-help' for a list of available types

PC, set, factorization,