1: /* 
  2:    Private context for a Newton line search method for solving
  3:    systems of nonlinear equations
  4:  */

  6: #ifndef __SNES_LS_H
 8:  #include include/private/snesimpl.h

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

 23: #endif