PETSc version 3.17.5
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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

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