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- /* multiroots/test.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough
- *
- * 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 <stdio.h>
- #include <gsl/gsl_vector.h>
- #include <gsl/gsl_test.h>
- #include <gsl/gsl_multiroots.h>
-
- #include <gsl/gsl_ieee_utils.h>
-
- #include "test_funcs.h"
- int test_fdf (const char * desc, gsl_multiroot_function_fdf * function, initpt_function initpt, double factor, const gsl_multiroot_fdfsolver_type * T);
- int test_f (const char * desc, gsl_multiroot_function_fdf * fdf, initpt_function initpt, double factor, const gsl_multiroot_fsolver_type * T);
-
-
- int
- main (void)
- {
- const gsl_multiroot_fsolver_type * fsolvers[5] ;
- const gsl_multiroot_fsolver_type ** T1 ;
-
- const gsl_multiroot_fdfsolver_type * fdfsolvers[5] ;
- const gsl_multiroot_fdfsolver_type ** T2 ;
-
- double f;
-
- fsolvers[0] = gsl_multiroot_fsolver_dnewton;
- fsolvers[1] = gsl_multiroot_fsolver_broyden;
- fsolvers[2] = gsl_multiroot_fsolver_hybrid;
- fsolvers[3] = gsl_multiroot_fsolver_hybrids;
- fsolvers[4] = 0;
-
- fdfsolvers[0] = gsl_multiroot_fdfsolver_newton;
- fdfsolvers[1] = gsl_multiroot_fdfsolver_gnewton;
- fdfsolvers[2] = gsl_multiroot_fdfsolver_hybridj;
- fdfsolvers[3] = gsl_multiroot_fdfsolver_hybridsj;
- fdfsolvers[4] = 0;
-
- gsl_ieee_env_setup();
-
-
- f = 1.0 ;
-
- T1 = fsolvers ;
-
- while (*T1 != 0)
- {
- test_f ("Rosenbrock", &rosenbrock, rosenbrock_initpt, f, *T1);
- test_f ("Roth", &roth, roth_initpt, f, *T1);
- test_f ("Powell badly scaled", &powellscal, powellscal_initpt, f, *T1);
- test_f ("Brown badly scaled", &brownscal, brownscal_initpt, f, *T1);
- test_f ("Powell singular", &powellsing, powellsing_initpt, f, *T1);
- test_f ("Wood", &wood, wood_initpt, f, *T1);
- test_f ("Helical", &helical, helical_initpt, f, *T1);
- test_f ("Discrete BVP", &dbv, dbv_initpt, f, *T1);
- test_f ("Trig", &trig, trig_initpt, f, *T1);
- T1++;
- }
-
- T2 = fdfsolvers ;
-
- while (*T2 != 0)
- {
- test_fdf ("Rosenbrock", &rosenbrock, rosenbrock_initpt, f, *T2);
- test_fdf ("Roth", &roth, roth_initpt, f, *T2);
- test_fdf ("Powell badly scaled", &powellscal, powellscal_initpt, f, *T2);
- test_fdf ("Brown badly scaled", &brownscal, brownscal_initpt, f, *T2);
- test_fdf ("Powell singular", &powellsing, powellsing_initpt, f, *T2);
- test_fdf ("Wood", &wood, wood_initpt, f, *T2);
- test_fdf ("Helical", &helical, helical_initpt, f, *T2);
- test_fdf ("Discrete BVP", &dbv, dbv_initpt, f, *T2);
- test_fdf ("Trig", &trig, trig_initpt, f, *T2);
- T2++;
- }
-
- exit (gsl_test_summary ());
- }
-
- void scale (gsl_vector * x, double factor);
-
- void
- scale (gsl_vector * x, double factor)
- {
- size_t i, n = x->size;
-
- if (gsl_vector_isnull(x))
- {
- for (i = 0; i < n; i++)
- {
- gsl_vector_set (x, i, factor);
- }
- }
- else
- {
- for (i = 0; i < n; i++)
- {
- double xi = gsl_vector_get(x, i);
- gsl_vector_set(x, i, factor * xi);
- }
- }
- }
-
- int
- test_fdf (const char * desc, gsl_multiroot_function_fdf * function,
- initpt_function initpt, double factor,
- const gsl_multiroot_fdfsolver_type * T)
- {
- int status;
- double residual = 0;
- size_t i, n = function->n, iter = 0;
-
- gsl_vector *x = gsl_vector_alloc (n);
- gsl_matrix *J = gsl_matrix_alloc (n, n);
-
- gsl_multiroot_fdfsolver *s;
-
- (*initpt) (x);
-
- if (factor != 1.0) scale(x, factor);
-
- s = gsl_multiroot_fdfsolver_alloc (T, n);
- gsl_multiroot_fdfsolver_set (s, function, x);
-
- do
- {
- iter++;
- status = gsl_multiroot_fdfsolver_iterate (s);
-
- if (status)
- break ;
-
- status = gsl_multiroot_test_residual (s->f, 0.0000001);
- }
- while (status == GSL_CONTINUE && iter < 1000);
-
- #ifdef DEBUG
- printf("x "); gsl_vector_fprintf (stdout, s->x, "%g"); printf("\n");
- printf("f "); gsl_vector_fprintf (stdout, s->f, "%g"); printf("\n");
- #endif
-
-
- #ifdef TEST_JACOBIAN
- {
- double r,sum; size_t j;
-
- gsl_multiroot_function f1 ;
- f1.f = function->f ;
- f1.n = function->n ;
- f1.params = function->params ;
-
- gsl_multiroot_fdjacobian (&f1, s->x, s->f, GSL_SQRT_DBL_EPSILON, J);
-
- /* compare J and s->J */
-
- r=0;sum=0;
- for (i = 0; i < n; i++)
- for (j = 0; j< n ; j++)
- {
- double u = gsl_matrix_get(J,i,j);
- double su = gsl_matrix_get(s->J, i, j);
- r = fabs(u - su)/(1e-6 + 1e-6 * fabs(u)); sum+=r;
- if (fabs(u - su) > 1e-6 + 1e-6 * fabs(u))
- printf("broken jacobian %g\n", r);
- }
- printf("avg r = %g\n", sum/(n*n));
- }
- #endif
-
- for (i = 0; i < n ; i++)
- {
- residual += fabs(gsl_vector_get(s->f, i));
- }
-
- gsl_multiroot_fdfsolver_free (s);
- gsl_matrix_free(J);
- gsl_vector_free(x);
-
- gsl_test(status, "%s on %s (%g), %u iterations, residual = %.2g", T->name, desc, factor, iter, residual);
-
- return status;
- }
-
-
- int
- test_f (const char * desc, gsl_multiroot_function_fdf * fdf,
- initpt_function initpt, double factor,
- const gsl_multiroot_fsolver_type * T)
- {
- int status;
- size_t i, n = fdf->n, iter = 0;
- double residual = 0;
-
- gsl_vector *x;
-
- gsl_multiroot_fsolver *s;
- gsl_multiroot_function function;
-
- function.f = fdf->f;
- function.params = fdf->params;
- function.n = n ;
-
- x = gsl_vector_alloc (n);
-
- (*initpt) (x);
-
- if (factor != 1.0) scale(x, factor);
-
- s = gsl_multiroot_fsolver_alloc (T, n);
- gsl_multiroot_fsolver_set (s, &function, x);
-
- /* printf("x "); gsl_vector_fprintf (stdout, s->x, "%g"); printf("\n"); */
- /* printf("f "); gsl_vector_fprintf (stdout, s->f, "%g"); printf("\n"); */
-
- do
- {
- iter++;
- status = gsl_multiroot_fsolver_iterate (s);
-
- if (status)
- break ;
-
- status = gsl_multiroot_test_residual (s->f, 0.0000001);
- }
- while (status == GSL_CONTINUE && iter < 1000);
-
- #ifdef DEBUG
- printf("x "); gsl_vector_fprintf (stdout, s->x, "%g"); printf("\n");
- printf("f "); gsl_vector_fprintf (stdout, s->f, "%g"); printf("\n");
- #endif
-
- for (i = 0; i < n ; i++)
- {
- residual += fabs(gsl_vector_get(s->f, i));
- }
-
- gsl_multiroot_fsolver_free (s);
- gsl_vector_free(x);
-
- gsl_test(status, "%s on %s (%g), %u iterations, residual = %.2g", T->name, desc, factor, iter, residual);
-
- return status;
- }
-