petsc-3.13.6 2020-09-29
SNESLineSearchGetLambda
Gets the last linesearch steplength discovered.
Synopsis
#include "petscsnes.h"
PetscErrorCode SNESLineSearchGetLambda(SNESLineSearch linesearch,PetscReal *lambda)
Input Parameters
linesearch -linesearch context
Output Parameters
lambda -The last steplength computed during SNESLineSearchApply()
Notes
This is useful in methods where the solver is ill-scaled and
requires some adaptive notion of the difference in scale between the
solution and the function. For instance, SNESQN may be scaled by the
line search lambda using the argument -snes_qn_scaling ls.
See Also
SNESLineSearchSetLambda(), SNESLineSearchGetDamping(), SNESLineSearchApply()
Level
advanced
Location
src/snes/linesearch/interface/linesearch.c
Index of all SNES routines
Table of Contents for all manual pages
Index of all manual pages