SNESLineSearchGetLambda

Gets the last line search steplength used

Synopsis

#include "petscsnes.h" 
PetscErrorCode SNESLineSearchGetLambda(SNESLineSearch linesearch, PetscReal *lambda)

Not Collective

Input Parameter

• linesearch - the line search context

Output Parameter

• lambda - The last steplength computed during SNESLineSearchApply()

Note

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

SNES: Nonlinear Solvers, SNES, SNESLineSearch, SNESLineSearchSetLambda(), SNESLineSearchGetDamping(), SNESLineSearchApply()

Level

advanced

Location

src/snes/linesearch/interface/linesearch.c

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