petsc-master 2015-10-04
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Sets the gradient evaluation routine for the line search


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

Input Parameter

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

Calling sequence of func

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

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


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


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

See Also

TaoLineSearchCreate(), TaoLineSearchSetObjectiveRoutine(), TaoLineSearchSetObjectiveAndGradientRoutine(), TaoLineSearchUseTaoRoutines()

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