| /* 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; |
| } |
| |
| |