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- /* siman/test.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000 Mark Galassi
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or (at
- * your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #include <config.h>
- #include <stdlib.h>
- #include <string.h>
- #include <math.h>
- #include <gsl/gsl_test.h>
- #include <gsl/gsl_rng.h>
- #include <gsl/gsl_siman.h>
- #include <gsl/gsl_ieee_utils.h>
- #include <stdio.h>
-
- /* set up parameters for this simulated annealing run */
- #define N_TRIES 200 /* how many points do we try before stepping */
- #define ITERS_FIXED_T 1000 /* how many iterations for each T? */
- #define STEP_SIZE 1.0 /* max step size in random walk */
- #define K 1.0 /* Boltzmann constant */
- #define T_INITIAL 0.008 /* initial temperature */
- #define MU_T 1.003 /* damping factor for temperature */
- #define T_MIN 2.0e-6
-
- gsl_siman_params_t params = {N_TRIES, ITERS_FIXED_T, STEP_SIZE,
- K, T_INITIAL, MU_T, T_MIN};
-
- inline double square (double x) ;
- inline double square (double x) { return x * x ; }
-
- double E1(void *xp);
- double M1(void *xp, void *yp);
- void S1(const gsl_rng * r, void *xp, double step_size);
- void P1(void *xp);
-
- /* now some functions to test in one dimension */
- double E1(void *xp)
- {
- double x = * ((double *) xp);
-
- return exp(-square(x-1))*sin(8*x) - exp(-square(x-1000))*0.89;
- }
-
- double M1(void *xp, void *yp)
- {
- double x = *((double *) xp);
- double y = *((double *) yp);
-
- return fabs(x - y);
- }
-
- void S1(const gsl_rng * r, void *xp, double step_size)
- {
- double old_x = *((double *) xp);
- double new_x;
-
- new_x = gsl_rng_uniform(r)*2*step_size - step_size + old_x;
-
- memcpy(xp, &new_x, sizeof(new_x));
- }
-
- void P1(void *xp)
- {
- printf(" %12g ", *((double *) xp));
- }
-
- int main(void)
- {
- double x_min = 1.36312999455315182 ;
- double x ;
-
- gsl_rng * r = gsl_rng_alloc (gsl_rng_env_setup()) ;
-
- gsl_ieee_env_setup ();
-
- /* The function tested here has multiple mimima.
- The global minimum is at x = 1.36312999, (f = -0.87287)
- There is a local minimum at x = 0.60146196, (f = -0.84893) */
-
- x = -10.0 ;
- gsl_siman_solve(r, &x, E1, S1, M1, NULL, NULL, NULL, NULL,
- sizeof(double), params);
- gsl_test_rel(x, x_min, 1e-3, "f(x)= exp(-(x-1)^2) sin(8x), x0=-10") ;
-
- x = +10.0 ;
- gsl_siman_solve(r, &x, E1, S1, M1, NULL, NULL, NULL, NULL,
- sizeof(double), params);
- gsl_test_rel(x, x_min, 1e-3, "f(x)= exp(-(x-1)^2) sin(8x), x0=10") ;
-
- /* Start at the false minimum */
-
- x = +0.6 ;
- gsl_siman_solve(r, &x, E1, S1, M1, NULL, NULL, NULL, NULL,
- sizeof(double), params);
- gsl_test_rel(x, x_min, 1e-3, "f(x)= exp(-(x-1)^2) sin(8x), x0=0.6") ;
-
- x = +0.5 ;
- gsl_siman_solve(r, &x, E1, S1, M1, NULL, NULL, NULL, NULL,
- sizeof(double), params);
- gsl_test_rel(x, x_min, 1e-3, "f(x)= exp(-(x-1)^2) sin(8x), x0=0.5") ;
-
- x = +0.4 ;
- gsl_siman_solve(r, &x, E1, S1, M1, NULL, NULL, NULL, NULL,
- sizeof(double), params);
- gsl_test_rel(x, x_min, 1e-3, "f(x)= exp(-(x-1)^2) sin(8x), x0=0.4") ;
-
- exit (gsl_test_summary ());
-
- #ifdef JUNK
- x0.D1 = 12.0;
- printf("#one dimensional problem, x0 = %f\n", x0.D1);
- gsl_siman_Usolve(r, &x0, test_E_1D, test_step_1D, distance_1D,
- print_pos_1D, params);
-
-
- x0.D2[0] = 12.0;
- x0.D2[1] = 5.5;
- printf("#two dimensional problem, (x0,y0) = (%f,%f)\n",
- x0.D2[0], x0.D2[1]);
- gsl_siman_Usolve(r, &x0, test_E_2D, test_step_2D, distance_2D,
- print_pos_2D, params);
-
- x0.D3[0] = 12.2;
- x0.D3[1] = 5.5;
- x0.D3[2] = -15.5;
- printf("#three dimensional problem, (x0,y0,z0) = (%f,%f,%f)\n",
- x0.D3[0], x0.D3[1], x0.D3[2]);
- gsl_siman_Usolve(r, &x0, test_E_3D, test_step_3D, distance_3D,
- print_pos_3D, params);
-
- x0.D2[0] = 12.2;
- x0.D2[1] = 5.5;
-
- gsl_siman_solve(r, &x0, test_E_2D, test_step_2D, distance_2D, print_pos_2D, params);
-
- x0.D3[0] = 12.2;
- x0.D3[1] = 5.5;
- x0.D3[2] = -15.5;
-
- gsl_siman_solve(r, &x0, test_E_3D, test_step_3D, distance_3D, print_pos_3D, params);
-
- return 0;
- #endif
- }
-
-
-
-