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Diffstat (limited to 'gsl-1.9/interpolation/interp.c')
| -rw-r--r-- | gsl-1.9/interpolation/interp.c | 244 |
1 files changed, 244 insertions, 0 deletions
diff --git a/gsl-1.9/interpolation/interp.c b/gsl-1.9/interpolation/interp.c new file mode 100644 index 0000000..0361730 --- /dev/null +++ b/gsl-1.9/interpolation/interp.c @@ -0,0 +1,244 @@ +/* interpolation/interp.c + * + * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman + * + * 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. + */ + +/* Author: G. Jungman + */ +#include <config.h> +#include <gsl/gsl_errno.h> +#include <gsl/gsl_math.h> +#include <gsl/gsl_interp.h> + +#define DISCARD_STATUS(s) if ((s) != GSL_SUCCESS) { GSL_ERROR_VAL("interpolation error", (s), GSL_NAN); } + +gsl_interp * +gsl_interp_alloc (const gsl_interp_type * T, size_t size) +{ + gsl_interp * interp; + + if (size < T->min_size) + { + GSL_ERROR_NULL ("insufficient number of points for interpolation type", + GSL_EINVAL); + } + + interp = (gsl_interp *) malloc (sizeof(gsl_interp)); + + if (interp == NULL) + { + GSL_ERROR_NULL ("failed to allocate space for interp struct", + GSL_ENOMEM); + } + + interp->type = T; + interp->size = size; + + if (interp->type->alloc == NULL) + { + interp->state = NULL; + return interp; + } + + interp->state = interp->type->alloc(size); + + if (interp->state == NULL) + { + free (interp); + GSL_ERROR_NULL ("failed to allocate space for interp state", GSL_ENOMEM); + }; + + return interp; +} + +int +gsl_interp_init (gsl_interp * interp, const double x_array[], const double y_array[], size_t size) +{ + if (size != interp->size) + { + GSL_ERROR ("data must match size of interpolation object", GSL_EINVAL); + } + + interp->xmin = x_array[0]; + interp->xmax = x_array[size - 1]; + + { + int status = interp->type->init(interp->state, x_array, y_array, size); + return status; + } +} + +const char * +gsl_interp_name(const gsl_interp * interp) +{ + return interp->type->name; +} + +unsigned int +gsl_interp_min_size(const gsl_interp * interp) +{ + return interp->type->min_size; +} + +void +gsl_interp_free (gsl_interp * interp) +{ + if (interp->type->free) + interp->type->free (interp->state); + free (interp); +} + + + +int +gsl_interp_eval_e (const gsl_interp * interp, + const double xa[], const double ya[], double x, + gsl_interp_accel * a, double *y) +{ + if (x < interp->xmin) + { + *y = ya[0]; + return GSL_EDOM; + } + else if (x > interp->xmax) + { + *y = ya[interp->size - 1]; + return GSL_EDOM; + } + + return interp->type->eval (interp->state, xa, ya, interp->size, x, a, y); +} + +double +gsl_interp_eval (const gsl_interp * interp, + const double xa[], const double ya[], double x, + gsl_interp_accel * a) +{ + double y; + int status = interp->type->eval (interp->state, xa, ya, interp->size, x, a, &y); + + DISCARD_STATUS(status); + + return y; +} + + +int +gsl_interp_eval_deriv_e (const gsl_interp * interp, + const double xa[], const double ya[], double x, + gsl_interp_accel * a, + double *dydx) +{ + if (x < interp->xmin) + { + *dydx = 0.0; + return GSL_EDOM; + } + else if (x > interp->xmax) + { + *dydx = 0.0; + return GSL_EDOM; + } + + return interp->type->eval_deriv (interp->state, xa, ya, interp->size, x, a, dydx); +} + +double +gsl_interp_eval_deriv (const gsl_interp * interp, + const double xa[], const double ya[], double x, + gsl_interp_accel * a) +{ + double dydx; + int status = interp->type->eval_deriv (interp->state, xa, ya, interp->size, x, a, &dydx); + + DISCARD_STATUS(status); + + return dydx; +} + + +int +gsl_interp_eval_deriv2_e (const gsl_interp * interp, + const double xa[], const double ya[], double x, + gsl_interp_accel * a, + double * d2) +{ + if (x < interp->xmin) + { + *d2 = 0.0; + return GSL_EDOM; + } + else if (x > interp->xmax) + { + *d2 = 0.0; + return GSL_EDOM; + } + + return interp->type->eval_deriv2 (interp->state, xa, ya, interp->size, x, a, d2); +} + +double +gsl_interp_eval_deriv2 (const gsl_interp * interp, + const double xa[], const double ya[], double x, + gsl_interp_accel * a) +{ + double d2; + int status = interp->type->eval_deriv2 (interp->state, xa, ya, interp->size, x, a, &d2); + + DISCARD_STATUS(status); + + return d2; +} + + +int +gsl_interp_eval_integ_e (const gsl_interp * interp, + const double xa[], const double ya[], + double a, double b, + gsl_interp_accel * acc, + double * result) +{ + if (a > b || a < interp->xmin || b > interp->xmax) + { + *result = 0.0; + return GSL_EDOM; + } + else if(a == b) + { + *result = 0.0; + return GSL_SUCCESS; + } + + return interp->type->eval_integ (interp->state, xa, ya, interp->size, acc, a, b, result); +} + + +double +gsl_interp_eval_integ (const gsl_interp * interp, + const double xa[], const double ya[], + double a, double b, + gsl_interp_accel * acc) +{ + double result; + int status = interp->type->eval_integ (interp->state, xa, ya, interp->size, acc, a, b, &result); + + DISCARD_STATUS(status); + + return result; +} + + |