/usr/include/gsl/gsl_interp2d.h is in libgsl-dev 2.1+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* 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.
*/
#ifndef __GSL_INTERP2D_H__
#define __GSL_INTERP2D_H__
#include <gsl/gsl_interp.h>
#undef __BEGIN_DECLS
#undef __END_DECLS
#ifdef __cplusplus
# define __BEGIN_DECLS extern "C" {
# define __END_DECLS }
#else
# define __BEGIN_DECLS /* empty */
# define __END_DECLS /* empty */
#endif
__BEGIN_DECLS
typedef struct {
const char* name;
unsigned int min_size;
void * (*alloc)(size_t xsize, size_t ysize);
int (*init)(void *, const double xa[], const double ya[], const double za[], size_t xsize, size_t ysize);
int (*eval)(const void *, const double xa[], const double ya[], const double za[], size_t xsize, size_t ysize, double x, double y, gsl_interp_accel*, gsl_interp_accel*, double* z);
int (*eval_deriv_x) (const void *, const double xa[], const double ya[], const double za[], size_t xsize, size_t ysize, double x, double y, gsl_interp_accel*, gsl_interp_accel*, double* z_p);
int (*eval_deriv_y) (const void *, const double xa[], const double ya[], const double za[], size_t xsize, size_t ysize, double x, double y, gsl_interp_accel*, gsl_interp_accel*, double* z_p);
int (*eval_deriv_xx) (const void *, const double xa[], const double ya[], const double za[], size_t xsize, size_t ysize, double x, double y, gsl_interp_accel*, gsl_interp_accel*, double* z_pp);
int (*eval_deriv_xy) (const void *, const double xa[], const double ya[], const double za[], size_t xsize, size_t ysize, double x, double y, gsl_interp_accel*, gsl_interp_accel*, double* z_pp);
int (*eval_deriv_yy) (const void *, const double xa[], const double ya[], const double za[], size_t xsize, size_t ysize, double x, double y, gsl_interp_accel*, gsl_interp_accel*, double* z_pp);
void (*free)(void *);
} gsl_interp2d_type;
typedef struct {
const gsl_interp2d_type * type; /* interpolation type */
double xmin; /* minimum value of x for which data have been provided */
double xmax; /* maximum value of x for which data have been provided */
double ymin; /* minimum value of y for which data have been provided */
double ymax; /* maximum value of y for which data have been provided */
size_t xsize; /* number of x values provided */
size_t ysize; /* number of y values provided */
void * state; /* internal state object specific to the interpolation type */
} gsl_interp2d;
/* available types */
GSL_VAR const gsl_interp2d_type * gsl_interp2d_bilinear;
GSL_VAR const gsl_interp2d_type * gsl_interp2d_bicubic;
gsl_interp2d * gsl_interp2d_alloc(const gsl_interp2d_type * T, const size_t xsize,
const size_t ysize);
const char * gsl_interp2d_name(const gsl_interp2d * interp);
size_t gsl_interp2d_min_size(const gsl_interp2d * interp);
size_t gsl_interp2d_type_min_size(const gsl_interp2d_type * T);
int gsl_interp2d_set(const gsl_interp2d * interp, double zarr[],
const size_t i, const size_t j, const double z);
double gsl_interp2d_get(const gsl_interp2d * interp, const double zarr[],
const size_t i, const size_t j);
size_t gsl_interp2d_idx(const gsl_interp2d * interp,
const size_t i, const size_t j);
int gsl_interp2d_init(gsl_interp2d * interp, const double xa[], const double ya[],
const double za[], const size_t xsize, const size_t ysize);
void gsl_interp2d_free(gsl_interp2d * interp);
double gsl_interp2d_eval(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[], const double x,
const double y, gsl_interp_accel * xa, gsl_interp_accel * ya);
double gsl_interp2d_eval_extrap(const gsl_interp2d * interp,
const double xarr[], const double yarr[],
const double zarr[], const double x,
const double y, gsl_interp_accel * xa,
gsl_interp_accel * ya);
int gsl_interp2d_eval_e(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y, gsl_interp_accel* xa,
gsl_interp_accel* ya, double * z);
int gsl_interp2d_eval_e_extrap(const gsl_interp2d * interp,
const double xarr[],
const double yarr[],
const double zarr[],
const double x,
const double y,
gsl_interp_accel * xa,
gsl_interp_accel * ya,
double * z);
double gsl_interp2d_eval_deriv_x(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y, gsl_interp_accel * xa,
gsl_interp_accel * ya);
int gsl_interp2d_eval_deriv_x_e(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y,
gsl_interp_accel * xa, gsl_interp_accel * ya, double * z);
double gsl_interp2d_eval_deriv_y(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y,
gsl_interp_accel* xa, gsl_interp_accel* ya);
int gsl_interp2d_eval_deriv_y_e(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y,
gsl_interp_accel * xa, gsl_interp_accel * ya, double * z);
double gsl_interp2d_eval_deriv_xx(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y,
gsl_interp_accel * xa, gsl_interp_accel * ya);
int gsl_interp2d_eval_deriv_xx_e(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y,
gsl_interp_accel * xa, gsl_interp_accel * ya, double * z);
double gsl_interp2d_eval_deriv_yy(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y,
gsl_interp_accel * xa, gsl_interp_accel * ya);
int gsl_interp2d_eval_deriv_yy_e(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y,
gsl_interp_accel * xa, gsl_interp_accel * ya, double * z);
double gsl_interp2d_eval_deriv_xy(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y,
gsl_interp_accel * xa, gsl_interp_accel * ya);
int gsl_interp2d_eval_deriv_xy_e(const gsl_interp2d * interp, const double xarr[],
const double yarr[], const double zarr[],
const double x, const double y,
gsl_interp_accel * xa, gsl_interp_accel * ya, double * z);
__END_DECLS
#endif /* __GSL_INTERP2D_H__ */
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