PETSc version 3.16.5
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# 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 on PC

### 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 <shifttype> | - Sets shift type; use '-help' for a list of available types

### See Also

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
Index of all PC routines
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Index of all manual pages