petsc-3.7.1 2016-05-15
SNESLineSearchGetLambda
Gets the last linesearch steplength discovered.
Synopsis
#include "petscsnes.h"
PetscErrorCode SNESLineSearchGetLambda(SNESLineSearch linesearch,PetscReal *lambda)
Input Parameters
linesearch -linesearch context Many br
Output Parameters
lambda -The last steplength computed during SNESLineSearchApply() Many br
Many br
Notes
This is useful in methods where the solver is ill-scaled and Many brrequires some adaptive notion of the difference in scale between the Many brsolution and the function. For instance, SNESQN may be scaled by the Many brline search lambda using the argument -snes_qn_scaling ls. Many br
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