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

  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_NEWTONTR;

 25: #endif