/usr/include/spline3.h is in libalglib-dev 2.6.0-3.
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 (c) 2007, Sergey Bochkanov (ALGLIB project).
>>> SOURCE LICENSE >>>
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 (www.fsf.org); 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.
A copy of the GNU General Public License is available at
http://www.fsf.org/licensing/licenses
>>> END OF LICENSE >>>
*************************************************************************/
#ifndef _spline3_h
#define _spline3_h
#include "ap.h"
#include "ialglib.h"
void buildlinearspline(ap::real_1d_array x,
ap::real_1d_array y,
int n,
ap::real_1d_array& c);
void buildcubicspline(ap::real_1d_array x,
ap::real_1d_array y,
int n,
int boundltype,
double boundl,
int boundrtype,
double boundr,
ap::real_1d_array& c);
void buildhermitespline(ap::real_1d_array x,
ap::real_1d_array y,
ap::real_1d_array d,
int n,
ap::real_1d_array& c);
void buildakimaspline(ap::real_1d_array x,
ap::real_1d_array y,
int n,
ap::real_1d_array& c);
double splineinterpolation(const ap::real_1d_array& c, double x);
void splinedifferentiation(const ap::real_1d_array& c,
double x,
double& s,
double& ds,
double& d2s);
void splinecopy(const ap::real_1d_array& c, ap::real_1d_array& cc);
void splineunpack(const ap::real_1d_array& c, int& n, ap::real_2d_array& tbl);
void splinelintransx(ap::real_1d_array& c, double a, double b);
void splinelintransy(ap::real_1d_array& c, double a, double b);
double splineintegration(const ap::real_1d_array& c, double x);
void spline3buildtable(int n,
const int& diffn,
ap::real_1d_array x,
ap::real_1d_array y,
const double& boundl,
const double& boundr,
ap::real_2d_array& ctbl);
double spline3interpolate(int n, const ap::real_2d_array& c, const double& x);
#endif
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