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/* interpolation/spline2d.c
*
* Copyright 2012 David Zaslavsky
*
* 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 <stdlib.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_math.h>
#include <gsl/gsl_interp.h>
#include <gsl/gsl_interp2d.h>
#include <gsl/gsl_spline2d.h>
gsl_spline2d *
gsl_spline2d_alloc(const gsl_interp2d_type * T, size_t xsize, size_t ysize)
{
double * array_mem;
gsl_spline2d * interp;
if (xsize < T->min_size || ysize < T->min_size)
{
GSL_ERROR_NULL("insufficient number of points for interpolation type", GSL_EINVAL);
}
interp = calloc(1, sizeof(gsl_spline2d));
if (interp == NULL)
{
GSL_ERROR_NULL("failed to allocate space for gsl_spline2d struct", GSL_ENOMEM);
}
interp->interp_object.type = T;
interp->interp_object.xsize = xsize;
interp->interp_object.ysize = ysize;
if (interp->interp_object.type->alloc == NULL)
{
interp->interp_object.state = NULL;
}
else
{
interp->interp_object.state = interp->interp_object.type->alloc(xsize, ysize);
if (interp->interp_object.state == NULL)
{
gsl_spline2d_free(interp);
GSL_ERROR_NULL("failed to allocate space for gsl_spline2d state", GSL_ENOMEM);
}
}
/*
* Use one contiguous block of memory for all three data arrays.
* That way the code fails immediately if there isn't sufficient space for everything,
* rather than allocating one or two and then having to free them.
*/
array_mem = (double *)calloc(xsize + ysize + xsize * ysize, sizeof(double));
if (array_mem == NULL)
{
gsl_spline2d_free(interp);
GSL_ERROR_NULL("failed to allocate space for data arrays", GSL_ENOMEM);
}
interp->xarr = array_mem;
interp->yarr = array_mem + xsize;
interp->zarr = array_mem + xsize + ysize;
return interp;
} /* gsl_spline2d_alloc() */
int
gsl_spline2d_init(gsl_spline2d * interp, const double xarr[],
const double yarr[], const double zarr[],
size_t xsize, size_t ysize)
{
int status = gsl_interp2d_init(&(interp->interp_object), xarr, yarr, zarr, xsize, ysize);
memcpy(interp->xarr, xarr, xsize * sizeof(double));
memcpy(interp->yarr, yarr, ysize * sizeof(double));
memcpy(interp->zarr, zarr, xsize * ysize * sizeof(double));
return status;
} /* gsl_spline2d_init() */
void
gsl_spline2d_free(gsl_spline2d * interp)
{
RETURN_IF_NULL(interp);
if (interp->interp_object.type->free)
interp->interp_object.type->free(interp->interp_object.state);
/*
* interp->xarr points to the beginning of one contiguous block of memory
* that holds interp->xarr, interp->yarr, and interp->zarr. So it all gets
* freed with one call. cf. gsl_spline2d_alloc() implementation
*/
if (interp->xarr)
free(interp->xarr);
free(interp);
} /* gsl_spline2d_free() */
double
gsl_spline2d_eval(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya)
{
return gsl_interp2d_eval(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya);
}
int
gsl_spline2d_eval_e(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya,
double * z)
{
return gsl_interp2d_eval_e(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya, z);
}
double
gsl_spline2d_eval_extrap(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya)
{
return gsl_interp2d_eval_extrap(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya);
}
int
gsl_spline2d_eval_extrap_e(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya,
double * z)
{
return gsl_interp2d_eval_extrap_e(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya, z);
}
double
gsl_spline2d_eval_deriv_x(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya)
{
return gsl_interp2d_eval_deriv_x(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya);
}
int
gsl_spline2d_eval_deriv_x_e(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya,
double * z)
{
return gsl_interp2d_eval_deriv_x_e(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya, z);
}
double
gsl_spline2d_eval_deriv_y(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya)
{
return gsl_interp2d_eval_deriv_y(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya);
}
int
gsl_spline2d_eval_deriv_y_e(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya,
double * z)
{
return gsl_interp2d_eval_deriv_y_e(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya, z);
}
double
gsl_spline2d_eval_deriv_xx(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya)
{
return gsl_interp2d_eval_deriv_xx(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya);
}
int
gsl_spline2d_eval_deriv_xx_e(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya,
double * z)
{
return gsl_interp2d_eval_deriv_xx_e(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya, z);
}
double
gsl_spline2d_eval_deriv_yy(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya)
{
return gsl_interp2d_eval_deriv_yy(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya);
}
int
gsl_spline2d_eval_deriv_yy_e(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya,
double * z)
{
return gsl_interp2d_eval_deriv_yy_e(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya, z);
}
double
gsl_spline2d_eval_deriv_xy(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya)
{
return gsl_interp2d_eval_deriv_xy(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya);
}
int
gsl_spline2d_eval_deriv_xy_e(const gsl_spline2d * interp, const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya,
double * z)
{
return gsl_interp2d_eval_deriv_xy_e(&(interp->interp_object), interp->xarr, interp->yarr,
interp->zarr, x, y, xa, ya, z);
}
size_t
gsl_spline2d_min_size(const gsl_spline2d * interp)
{
return gsl_interp2d_min_size(&(interp->interp_object));
}
const char *
gsl_spline2d_name(const gsl_spline2d * interp)
{
return gsl_interp2d_name(&(interp->interp_object));
}
int
gsl_spline2d_set(const gsl_spline2d * interp, double zarr[],
const size_t i, const size_t j, const double z)
{
return gsl_interp2d_set(&(interp->interp_object), zarr, i, j, z);
} /* gsl_spline2d_set() */
double
gsl_spline2d_get(const gsl_spline2d * interp, const double zarr[],
const size_t i, const size_t j)
{
return gsl_interp2d_get(&(interp->interp_object), zarr, i, j);
} /* gsl_spline2d_get() */
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