23.2 Simulated Annealing functions

Simulated annealing: gsl_siman_Efunc_t

double (*gsl_siman_Efunc_t) (void *xp);

Simulated annealing: gsl_siman_step_t

void (*gsl_siman_step_t) (void *xp, double step_size);

Simulated annealing: gsl_siman_metric_t

double (*gsl_siman_metric_t) (void *xp, void *yp);

Simulated annealing: gsl_siman_print_t

void (*gsl_siman_print_t) (void *xp);

Simulated annealing: gsl_siman_params_t

These are the parameters that control a run of gsl_siman_solve.

/* this structure contains all the information needed to structure the search, beyond the energy function, the step function and the initial guess. */ struct s_siman_params { /* how many points to try for each step */ int n_tries; /* how many iterations at each temperature? */ int iters_fixed_T; /* max step size in the random walk */ double step_size; /* the following parameters are for the Boltzmann distribution */ double k, t_initial, mu_t, t_min; }; typedef struct s_siman_params gsl_siman_params_t;

Simulated annealing: void gsl_siman_solve (void *x0_p, gsl_siman_Efunc_t Ef, gsl_siman_metric_t distance, gsl_siman_print_t print_position, size_t element_size, gsl_siman_params_t params)

Does a simulated annealing search through a given space. The space is specified by providing the functions Ef, distance, print_position, element_size.

The params structure (described above) controls the run by providing the temperature schedule and other tunable parameters to the algorithm (see section 23.1 Simulated Annealing algorithm). p The result (optimal point in the space) is placed in *x0_p.

If print_position is not null, a log will be printed to the screen with the following columns:

number_of_iterations temperature x x-(*x0_p) Ef(x)

If print_position is null, no information is printed to the screen.