petsc-3.9.2 2018-05-20
Report Typos and Errors

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 or PETSC_DECIDE for the default; use '-help' for a list of available types

Keywords

PC, set, factorization,

See Also

PCFactorSetZeroPivot(), PCFactorSetShiftAmount()

Level

intermediate

Location

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

Examples

src/ksp/pc/examples/tutorials/ex1.c.html
src/ksp/pc/examples/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
Table of Contents for all manual pages
Index of all manual pages