1: /* $Id: tr.h,v 1.9 2001/08/07 21:31:09 bsmith Exp $ */

  3: /*
  4:    Context for a Newton trust region method for solving a system 
  5:    of nonlinear equations
  6:  */

  8: #ifndef __SNES_TR_H
 10:  #include src/snes/snesimpl.h

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

 26: #endif