petsc-3.9.4 2018-09-11
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
Implementations
PCFactorSetShiftAmount_Factor in src/ksp/pc/impls/factor/factimpl.c
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages