diff options
Diffstat (limited to 'gsl-1.9/roots/fsolver.c')
-rw-r--r-- | gsl-1.9/roots/fsolver.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/gsl-1.9/roots/fsolver.c b/gsl-1.9/roots/fsolver.c new file mode 100644 index 0000000..039c554 --- /dev/null +++ b/gsl-1.9/roots/fsolver.c @@ -0,0 +1,107 @@ +/* roots/fsolver.c + * + * Copyright (C) 1996, 1997, 1998, 1999, 2000 Reid Priedhorsky, 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_roots.h> + +gsl_root_fsolver * +gsl_root_fsolver_alloc (const gsl_root_fsolver_type * T) +{ + gsl_root_fsolver * s = (gsl_root_fsolver *) malloc (sizeof (gsl_root_fsolver)); + + if (s == 0) + { + GSL_ERROR_VAL ("failed to allocate space for root solver 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 root solver state", + GSL_ENOMEM, 0); + }; + + s->type = T ; + s->function = NULL ; + + return s; +} + +int +gsl_root_fsolver_set (gsl_root_fsolver * s, gsl_function * f, double x_lower, double x_upper) +{ + if (x_lower > x_upper) + { + GSL_ERROR ("invalid interval (lower > upper)", GSL_EINVAL); + } + + s->function = f; + s->root = 0.5 * (x_lower + x_upper); /* initial estimate */ + s->x_lower = x_lower; + s->x_upper = x_upper; + + return (s->type->set) (s->state, s->function, &(s->root), x_lower, x_upper); +} + +int +gsl_root_fsolver_iterate (gsl_root_fsolver * s) +{ + return (s->type->iterate) (s->state, + s->function, &(s->root), + &(s->x_lower), &(s->x_upper)); +} + +void +gsl_root_fsolver_free (gsl_root_fsolver * s) +{ + free (s->state); + free (s); +} + +const char * +gsl_root_fsolver_name (const gsl_root_fsolver * s) +{ + return s->type->name; +} + +double +gsl_root_fsolver_root (const gsl_root_fsolver * s) +{ + return s->root; +} + +double +gsl_root_fsolver_x_lower (const gsl_root_fsolver * s) +{ + return s->x_lower; +} + +double +gsl_root_fsolver_x_upper (const gsl_root_fsolver * s) +{ + return s->x_upper; +} + |