2: /*
  3:    Context for a Newton trust region method for solving a system 
  4:    of nonlinear equations
  5:  */

  7: #ifndef __SNES_TR_H
  9: #include <petsc-private/snesimpl.h>

 11: typedef struct {
 12:   /* ---- Parameters used by the trust region method  ---- */
 13:   PetscReal  mu;                /* used to compute trust region parameter */
 14:   PetscReal  eta;                /* used to compute trust region parameter */
 15:   PetscReal  delta;                /* trust region parameter */
 16:   PetscReal  delta0;        /* used to initialize trust region parameter */
 17:   PetscReal  delta1;        /* used to compute trust region parameter */
 18:   PetscReal  delta2;        /* used to compute trust region parameter */
 19:   PetscReal  delta3;        /* used to compute trust region parameter */
 20:   PetscReal  sigma;                /* used to detemine termination */
 21:   PetscBool  itflag;        /* flag for convergence testing */
 22:   PetscReal  rnorm0,ttol;   /* used for KSP convergence test */
 23: } SNES_TR;

 25: #endif