| /* multimin/fminimizer.c |
| * |
| * Copyright (C) 2002 Tuomo Keskitalo, Ivo Alxneit |
| * |
| * 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 <gsl/gsl_errno.h> |
| #include <gsl/gsl_multimin.h> |
| |
| gsl_multimin_fminimizer * |
| gsl_multimin_fminimizer_alloc (const gsl_multimin_fminimizer_type * T, |
| size_t n) |
| { |
| int status; |
| |
| gsl_multimin_fminimizer *s = |
| (gsl_multimin_fminimizer *) malloc (sizeof (gsl_multimin_fminimizer)); |
| |
| if (s == 0) |
| { |
| GSL_ERROR_VAL ("failed to allocate space for minimizer struct", |
| GSL_ENOMEM, 0); |
| } |
| |
| s->type = T; |
| |
| s->x = gsl_vector_calloc (n); |
| |
| if (s->x == 0) |
| { |
| free (s); |
| GSL_ERROR_VAL ("failed to allocate space for x", GSL_ENOMEM, 0); |
| } |
| |
| s->state = malloc (T->size); |
| |
| if (s->state == 0) |
| { |
| gsl_vector_free (s->x); |
| free (s); |
| GSL_ERROR_VAL ("failed to allocate space for minimizer state", |
| GSL_ENOMEM, 0); |
| } |
| |
| status = (T->alloc) (s->state, n); |
| |
| if (status != GSL_SUCCESS) |
| { |
| free (s->state); |
| gsl_vector_free (s->x); |
| free (s); |
| |
| GSL_ERROR_VAL ("failed to initialize minimizer state", GSL_ENOMEM, 0); |
| } |
| |
| return s; |
| } |
| |
| int |
| gsl_multimin_fminimizer_set (gsl_multimin_fminimizer * s, |
| gsl_multimin_function * f, |
| const gsl_vector * x, |
| const gsl_vector * step_size) |
| { |
| if (s->x->size != f->n) |
| { |
| GSL_ERROR ("function incompatible with solver size", GSL_EBADLEN); |
| } |
| |
| if (x->size != f->n || step_size->size != f->n) |
| { |
| GSL_ERROR ("vector length not compatible with function", GSL_EBADLEN); |
| } |
| |
| s->f = f; |
| |
| gsl_vector_memcpy (s->x,x); |
| |
| return (s->type->set) (s->state, s->f, s->x, &(s->size), step_size); |
| } |
| |
| void |
| gsl_multimin_fminimizer_free (gsl_multimin_fminimizer * s) |
| { |
| (s->type->free) (s->state); |
| free (s->state); |
| gsl_vector_free (s->x); |
| free (s); |
| } |
| |
| int |
| gsl_multimin_fminimizer_iterate (gsl_multimin_fminimizer * s) |
| { |
| return (s->type->iterate) (s->state, s->f, s->x, &(s->size), &(s->fval)); |
| } |
| |
| const char * |
| gsl_multimin_fminimizer_name (const gsl_multimin_fminimizer * s) |
| { |
| return s->type->name; |
| } |
| |
| |
| gsl_vector * |
| gsl_multimin_fminimizer_x (const gsl_multimin_fminimizer * s) |
| { |
| return s->x; |
| } |
| |
| double |
| gsl_multimin_fminimizer_minimum (const gsl_multimin_fminimizer * s) |
| { |
| return s->fval; |
| } |
| |
| double |
| gsl_multimin_fminimizer_size (const gsl_multimin_fminimizer * s) |
| { |
| return s->size; |
| } |