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- /* interpolation/spline.c
- *
- * Copyright (C) 2001 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #include <config.h>
- #include <string.h>
- #include <gsl/gsl_errno.h>
- #include <gsl/gsl_interp.h>
- #include <gsl/gsl_spline.h>
-
- gsl_spline *
- gsl_spline_alloc (const gsl_interp_type * T, size_t size)
- {
- gsl_spline * spline = (gsl_spline *) malloc (sizeof(gsl_spline));
-
- if (spline == NULL)
- {
- GSL_ERROR_NULL ("failed to allocate space for spline struct",
- GSL_ENOMEM);
- }
-
- spline->interp = gsl_interp_alloc (T, size);
-
- if (spline->interp == NULL)
- {
- free (spline);
- GSL_ERROR_NULL ("failed to allocate space for interp", GSL_ENOMEM);
- };
-
- spline->x = (double *) malloc (size * sizeof(double));
-
- if (spline->x == NULL)
- {
- gsl_interp_free(spline->interp);
- free(spline);
- GSL_ERROR_NULL ("failed to allocate space for x", GSL_ENOMEM);
- }
-
- spline->y = (double *) malloc (size * sizeof(double));
-
- if (spline->y == NULL)
- {
- free(spline->x);
- gsl_interp_free(spline->interp);
- free(spline);
- GSL_ERROR_NULL ("failed to allocate space for y", GSL_ENOMEM);
- }
-
- spline->size = size;
-
- return spline;
- }
-
- int
- gsl_spline_init (gsl_spline * spline, const double x_array[], const double y_array[], size_t size)
- {
- if (size != spline->size)
- {
- GSL_ERROR ("data must match size of spline object", GSL_EINVAL);
- }
-
- memcpy (spline->x, x_array, size * sizeof(double));
- memcpy (spline->y, y_array, size * sizeof(double));
-
- {
- int status = gsl_interp_init (spline->interp, x_array, y_array, size);
- return status;
- }
- }
-
- void
- gsl_spline_free (gsl_spline * spline)
- {
- gsl_interp_free (spline->interp);
- free (spline->x);
- free (spline->y);
- free (spline);
- }
-
- int
- gsl_spline_eval_e (const gsl_spline * spline,
- double x,
- gsl_interp_accel * a, double *y)
- {
- return gsl_interp_eval_e (spline->interp,
- spline->x, spline->y,
- x, a, y);
- }
-
- double
- gsl_spline_eval (const gsl_spline * spline,
- double x,
- gsl_interp_accel * a)
- {
- return gsl_interp_eval (spline->interp,
- spline->x, spline->y,
- x, a);
- }
-
-
- int
- gsl_spline_eval_deriv_e (const gsl_spline * spline,
- double x,
- gsl_interp_accel * a,
- double *dydx)
- {
- return gsl_interp_eval_deriv_e (spline->interp,
- spline->x, spline->y,
- x, a, dydx);
- }
-
- double
- gsl_spline_eval_deriv (const gsl_spline * spline,
- double x,
- gsl_interp_accel * a)
- {
- return gsl_interp_eval_deriv (spline->interp,
- spline->x, spline->y,
- x, a);
- }
-
-
- int
- gsl_spline_eval_deriv2_e (const gsl_spline * spline,
- double x,
- gsl_interp_accel * a,
- double * d2)
- {
- return gsl_interp_eval_deriv2_e (spline->interp,
- spline->x, spline->y,
- x, a, d2);
- }
-
- double
- gsl_spline_eval_deriv2 (const gsl_spline * spline,
- double x,
- gsl_interp_accel * a)
- {
- return gsl_interp_eval_deriv2 (spline->interp,
- spline->x, spline->y,
- x, a);
- }
-
-
- int
- gsl_spline_eval_integ_e (const gsl_spline * spline,
- double a, double b,
- gsl_interp_accel * acc,
- double * result)
- {
- return gsl_interp_eval_integ_e (spline->interp,
- spline->x, spline->y,
- a, b, acc, result);
- }
-
-
- double
- gsl_spline_eval_integ (const gsl_spline * spline,
- double a, double b,
- gsl_interp_accel * acc)
- {
- return gsl_interp_eval_integ (spline->interp,
- spline->x, spline->y,
- a, b, acc);
- }
-
-