petsc-master 2015-10-06
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Sets the function evaluation routine for the line search


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

Input Parameter

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

Calling sequence of func

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

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


Use this routine only if you want the line search objective evaluation routine to be different from the Tao's objective evaluation routine. If you use this routine you must also set the line search gradient and/or function/gradient routine.


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(), TaoLineSearchSetGradientRoutine(), TaoLineSearchSetObjectiveAndGradientRoutine(), TaoLineSearchUseTaoRoutines()

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