1: /* $Id: ls.h,v 1.12 2001/08/06 21:17:15 bsmith Exp $ */

  3: /* 
  4:    Private context for a Newton line search method for solving
  5:    systems of nonlinear equations
  6:  */

  8: #ifndef __SNES_LS_H
 10:  #include src/snes/snesimpl.h

 12: typedef struct {
 13:   int       (*LineSearch)(SNES,void*,Vec,Vec,Vec,Vec,Vec,PetscReal,PetscReal*,PetscReal*,int*);
 14:   void      *lsP;                              /* user-defined line-search context (optional) */
 15:   /* --------------- Parameters used by line search method ----------------- */
 16:   PetscReal alpha;                                    /* used to determine sufficient reduction */
 17:   PetscReal maxstep;                           /* maximum step size */
 18:   PetscReal steptol;                           /* step convergence tolerance */
 19:   int       (*CheckStep)(SNES,void*,Vec,PetscTruth*); /* step-checking routine (optional) */
 20:   void      *checkP;                           /* user-defined step-checking context (optional) */
 21: } SNES_LS;

 23: #endif