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Diffstat (limited to 'gsl-1.9/min/fsolver.c')
| -rw-r--r-- | gsl-1.9/min/fsolver.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/gsl-1.9/min/fsolver.c b/gsl-1.9/min/fsolver.c new file mode 100644 index 0000000..36feb91 --- /dev/null +++ b/gsl-1.9/min/fsolver.c @@ -0,0 +1,200 @@ +/* min/fsolver.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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + */ + +#include <config.h> +#include <stdlib.h> +#include <string.h> +#include <gsl/gsl_errno.h> +#include <gsl/gsl_min.h> + +#include "min.h" + +static int +compute_f_values (gsl_function * f, double x_minimum, double * f_minimum, + double x_lower, double * f_lower, + double x_upper, double * f_upper); + + +static int +compute_f_values (gsl_function * f, double x_minimum, double * f_minimum, + double x_lower, double * f_lower, + double x_upper, double * f_upper) +{ + SAFE_FUNC_CALL(f, x_lower, f_lower); + SAFE_FUNC_CALL(f, x_upper, f_upper); + SAFE_FUNC_CALL(f, x_minimum, f_minimum); + + return GSL_SUCCESS; +} + +int +gsl_min_fminimizer_set (gsl_min_fminimizer * s, + gsl_function * f, + double x_minimum, double x_lower, double x_upper) +{ + int status ; + + double f_minimum, f_lower, f_upper; + + status = compute_f_values (f, x_minimum, &f_minimum, + x_lower, &f_lower, + x_upper, &f_upper); + + if (status != GSL_SUCCESS) + { + return status ; + } + + status = gsl_min_fminimizer_set_with_values (s, f, x_minimum, f_minimum, + x_lower, f_lower, + x_upper, f_upper); + return status; +} + +gsl_min_fminimizer * +gsl_min_fminimizer_alloc (const gsl_min_fminimizer_type * T) +{ + gsl_min_fminimizer * s = + (gsl_min_fminimizer *) malloc (sizeof (gsl_min_fminimizer)); + + if (s == 0) + { + GSL_ERROR_VAL ("failed to allocate space for minimizer struct", + GSL_ENOMEM, 0); + }; + + s->state = malloc (T->size); + + if (s->state == 0) + { + free (s); /* exception in constructor, avoid memory leak */ + + GSL_ERROR_VAL ("failed to allocate space for minimizer state", + GSL_ENOMEM, 0); + }; + + s->type = T ; + s->function = NULL; + + return s; +} + +int +gsl_min_fminimizer_set_with_values (gsl_min_fminimizer * s, gsl_function * f, + double x_minimum, double f_minimum, + double x_lower, double f_lower, + double x_upper, double f_upper) +{ + s->function = f; + s->x_minimum = x_minimum; + s->x_lower = x_lower; + s->x_upper = x_upper; + + if (x_lower > x_upper) + { + GSL_ERROR ("invalid interval (lower > upper)", GSL_EINVAL); + } + + if (x_minimum >= x_upper || x_minimum <= x_lower) + { + GSL_ERROR ("x_minimum must lie inside interval (lower < x < upper)", + GSL_EINVAL); + } + + s->f_lower = f_lower; + s->f_upper = f_upper; + s->f_minimum = f_minimum; + + if (f_minimum >= f_lower || f_minimum >= f_upper) + { + GSL_ERROR ("endpoints do not enclose a minimum", GSL_EINVAL); + } + + return (s->type->set) (s->state, s->function, + x_minimum, f_minimum, + x_lower, f_lower, + x_upper, f_upper); +} + + +int +gsl_min_fminimizer_iterate (gsl_min_fminimizer * s) +{ + return (s->type->iterate) (s->state, s->function, + &(s->x_minimum), &(s->f_minimum), + &(s->x_lower), &(s->f_lower), + &(s->x_upper), &(s->f_upper)); +} + +void +gsl_min_fminimizer_free (gsl_min_fminimizer * s) +{ + free (s->state); + free (s); +} + +const char * +gsl_min_fminimizer_name (const gsl_min_fminimizer * s) +{ + return s->type->name; +} + +/* Deprecated, use x_minimum instead */ +double +gsl_min_fminimizer_minimum (const gsl_min_fminimizer * s) +{ + return s->x_minimum; +} + +double +gsl_min_fminimizer_x_minimum (const gsl_min_fminimizer * s) +{ + return s->x_minimum; +} + +double +gsl_min_fminimizer_x_lower (const gsl_min_fminimizer * s) +{ + return s->x_lower; +} + +double +gsl_min_fminimizer_x_upper (const gsl_min_fminimizer * s) +{ + return s->x_upper; +} + +double +gsl_min_fminimizer_f_minimum (const gsl_min_fminimizer * s) +{ + return s->f_minimum; +} + +double +gsl_min_fminimizer_f_lower (const gsl_min_fminimizer * s) +{ + return s->f_lower; +} + +double +gsl_min_fminimizer_f_upper (const gsl_min_fminimizer * s) +{ + return s->f_upper; +} + |