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#

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

Index of all SNES routines
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Index of all manual pages