Actual source code: taocg.h
petsc-3.7.1 2016-05-15
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      1: /*
      2:     Context for conjugate gradient method (unconstrained minimization)
      3:  */

      6: #ifndef __TAO_CG_H

      9: #include <petsc/private/taoimpl.h>

     11: typedef struct {
     12:     Vec G_old;
     13:     Vec X_old;
     14:     Vec W; /*  work vector */

     16:     PetscReal eta;         /*  Restart tolerance */
     17:     PetscReal delta_max;   /*  Minimum value for scaling */
     18:     PetscReal delta_min;   /*  Maximum value for scaling */

     21:     /*  The algorithm restarts when the gradient at the current point g_k,
     22:        and the gradient of the previous point, g_{k-1}, satisfy the
     23:        following inequality:

     25:             abs(inner(g_k, g_{k-1})) > eta * norm(g_k, 2)^2. */

     27:     PetscInt ngradsteps;              /*  Number of gradient steps */
     28:     PetscInt nresetsteps;               /*  Number of reset steps */

     30:     PetscInt cg_type;           /*  Formula to use */
     31: } TAO_CG;

     33: #endif /* ifndef __TAO_CG_H */