SNESLineSearchGetNorms#
Gets the norms for the current solution X, the current update Y, and the current function value F.
Synopsis#
#include "petscsnes.h"
PetscErrorCode SNESLineSearchGetNorms(SNESLineSearch linesearch, PetscReal *xnorm, PetscReal *fnorm, PetscReal *ynorm)
Not Collective
Input Parameter#
linesearch - the line search context
Output Parameters#
xnorm - The norm of the current solution
fnorm - The norm of the current function, this is the
norm(function(X))whereXis the current solution.ynorm - The norm of the current update (after scaling by the linesearch computed lambda)
Notes#
Some values may not be up-to-date at particular points in the code.
This, in combination with SNESLineSearchSetNorms(), allow the line search and the SNESSolve_XXX() to share
computed values.
See Also#
SNES: Nonlinear Solvers, SNES, SNESLineSearch, SNESLineSearchSetNorms(), SNESLineSearchGetVecs()
Level#
developer
Location#
src/snes/linesearch/interface/linesearch.c
Index of all SNES routines
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Index of all manual pages