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/* interpolation/spline.c
*
* Copyright (C) 2001, 2007 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 3 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 <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;
}
}
const char *
gsl_spline_name(const gsl_spline * spline)
{
return gsl_interp_name(spline->interp);
}
unsigned int
gsl_spline_min_size(const gsl_spline * spline)
{
return gsl_interp_min_size(spline->interp);
}
void
gsl_spline_free (gsl_spline * spline)
{
RETURN_IF_NULL (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);
}
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