PCFactorSetShiftType#

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

Synopsis#

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

Logically Collective

Input Parameters#

  • pc - the preconditioner context

  • shifttype - type of shift; one of MAT_SHIFT_NONE, MAT_SHIFT_NONZERO, MAT_SHIFT_POSITIVE_DEFINITE, MAT_SHIFT_INBLOCKS

Options Database Key#

  • -pc_factor_shift_type - Sets shift type; use ‘-help’ for a list of available types

See Also#

PCCHOLESKY, PCLU, PCFactorSetZeroPivot(), PCFactorSetShiftAmount()

Level#

intermediate

Location#

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

Examples#

src/ksp/pc/tutorials/ex1.c.html
src/ksp/pc/tutorials/ex2.c.html

Implementations#

PCFactorSetShiftType_Factor in src/ksp/pc/impls/factor/factimpl.c
PCFactorSetShiftType_Redundant in src/ksp/pc/impls/redundant/redundant.c


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