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#
Examples#
Implementations#
PCFactorSetShiftType_Factor() in src/ksp/pc/impls/factor/factimpl.c
PCFactorSetShiftType_Redundant() in src/ksp/pc/impls/redundant/redundant.c
Index of all PC routines
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Index of all manual pages