petsc-3.6.1 2015-08-06
SNESLineSearchSetDamping
Sets the line search damping paramter.
Synopsis
#include "petscsnes.h"
PetscErrorCode SNESLineSearchSetDamping(SNESLineSearch linesearch,PetscReal damping)
Input Parameters
linesearch -linesearch context
damping -The damping parameter
Notes
The basic line search merely takes the update step scaled by the damping parameter.
The use of the damping parameter in the l2 and cp line searches is much more subtle;
it is used as a starting point in calculating the secant step. However, the eventual
step may be of greater length than the damping parameter. In the bt line search it is
used as the maximum possible step length, as the bt line search only backtracks.
See Also
SNESLineSearchGetDamping()
Level:intermediate
Location:src/snes/linesearch/interface/linesearch.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages