petsc-3.12.5 2020-03-29
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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