petsc-master 2015-10-05
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Sets the objective/gradient evaluation routine for the line search


#include "petsctaolinesearch.h" 
PetscErrorCode TaoLineSearchSetObjectiveAndGradientRoutine(TaoLineSearch ls, PetscErrorCode(*func)(TaoLineSearch ls, Vec x, PetscReal *, Vec g, void*), void *ctx)
Logically Collective on TaoLineSearch

Input Parameter

ls - the TaoLineSearch context
func - the objective and gradient evaluation routine
ctx - the (optional) user-defined context for private data

Calling sequence of func

     func (TaoLinesearch ls, Vec x, PetscReal *f, Vec g, void *ctx);

x - input vector
f - function value
g - gradient vector
ctx (optional) user- defined context


Use this routine only if you want the line search objective and gradient evaluation routines to be different from the Tao's objective and gradient evaluation routines.


Some algorithms (lcl, gpcg) set their own objective routine for the line search, application programmers should be wary of overriding the default objective routine.

See Also

TaoLineSearchCreate(), TaoLineSearchSetObjectiveRoutine(), TaoLineSearchSetGradientRoutine(), TaoLineSearchUseTaoRoutines()

Index of all TaoLineSearch routines
Table of Contents for all manual pages
Index of all manual pages