petsc-3.14.5 2021-03-03
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# 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

### 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
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Index of all manual pages