petsc-3.5.2 2014-09-08
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
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages

Examples

src/ksp/pc/examples/tutorials/ex1.c.html
src/ksp/pc/examples/tutorials/ex2.c.html