/*
   Context for a Newton trust region method for solving a system
   of nonlinear equations
 */

#ifndef __SNES_TR_H
#define __SNES_TR_H
#include <petsc-private/snesimpl.h>

typedef struct {
  /* ---- Parameters used by the trust region method  ---- */
  PetscReal  mu;            /* used to compute trust region parameter */
  PetscReal  eta;           /* used to compute trust region parameter */
  PetscReal  delta;         /* trust region parameter */
  PetscReal  delta0;        /* used to initialize trust region parameter */
  PetscReal  delta1;        /* used to compute trust region parameter */
  PetscReal  delta2;        /* used to compute trust region parameter */
  PetscReal  delta3;        /* used to compute trust region parameter */
  PetscReal  sigma;         /* used to detemine termination */
  PetscBool  itflag;        /* flag for convergence testing */
  PetscReal  rnorm0,ttol;   /* used for KSP convergence test */
} SNES_NEWTONTR;

#endif