1 /* 2 Private context for a Newton line search method for solving 3 systems of nonlinear equations 4 */ 5 6 #ifndef __SNES_LS_H 7 #define __SNES_LS_H 8 #include <private/snesimpl.h> 9 10 typedef struct { 11 PetscErrorCode (*LineSearch)(SNES,void*,Vec,Vec,Vec,Vec,Vec,PetscReal,PetscReal,PetscReal*,PetscReal*,PetscBool *); 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 minlambda; /* determines smallest line search lambda used */ 17 PetscErrorCode (*precheckstep)(SNES,Vec,Vec,void*,PetscBool *); /* step-checking routine (optional) */ 18 void *precheck; /* user-defined step-checking context (optional) */ 19 PetscErrorCode (*postcheckstep)(SNES,Vec,Vec,Vec,void*,PetscBool *,PetscBool *); /* step-checking routine (optional) */ 20 void *postcheck; /* user-defined step-checking context (optional) */ 21 PetscViewer monitor; 22 } SNES_LS; 23 24 #endif 25 26