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

KSP: Linear System Solvers, PCCHOLESKY, PCLU, PCFactorSetZeroPivot(), PCFactorSetShiftAmount()

Level

intermediate

Location

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

Examples

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

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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Index of all PC routines
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Index of all manual pages