/usr/include/votca/tools/linspline.h is in libvotca-tools-dev 1.4.1-2.
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 2009-2011 The VOTCA Development Team (http://www.votca.org)
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef _LINSPLINE_H
#define _LINSPLINE_H
#include "spline.h"
#include <boost/numeric/ublas/vector.hpp>
#include <boost/numeric/ublas/vector_proxy.hpp>
#include <boost/numeric/ublas/vector_expression.hpp>
#include <iostream>
namespace votca { namespace tools {
namespace ub = boost::numeric::ublas;
/**
* \brief A Linear Spline Class
*
* class supports linear interpolation and linear fit of data
*/
class LinSpline : public Spline
{
public:
// default constructor
LinSpline() {};
//LinSpline() :
// _boundaries(splineNormal) {}
// destructor
~LinSpline() {};
// construct an interpolation spline
// x, y are the the points to construct interpolation, both vectors must be of same size
void Interpolate(ub::vector<double> &x, ub::vector<double> &y);
// fit spline through noisy data
// x,y are arrays with noisy data, both vectors must be of same size
void Fit(ub::vector<double> &x, ub::vector<double> &y);
// Calculate the function value
double Calculate(const double &x);
// Calculate the function derivative
double CalculateDerivative(const double &x);
// Calculate the function value for a whole array, story it in y
template<typename vector_type1, typename vector_type2>
void Calculate(vector_type1 &x, vector_type2 &y);
// Calculate the derivative value for a whole array, story it in y
template<typename vector_type1, typename vector_type2>
void CalculateDerivative(vector_type1 &x, vector_type2 &y);
protected:
// a,b for piecewise splines: ax+b
ub::vector<double> a;
ub::vector<double> b;
};
inline double LinSpline::Calculate(const double &r)
{
int interval = getInterval(r);
return a(interval)*r + b(interval);
}
inline double LinSpline::CalculateDerivative(const double &r)
{
int interval = getInterval(r);
return a(interval);
}
}}
#endif /* _LINSPLINE_H */
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