PolynomialTimeDependence.h

Go to the documentation of this file.

/*
 *  Copyright (c) 2014, Chris Rogers
 *  All rights reserved.
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *  1. Redistributions of source code must retain the above copyright notice,
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. Neither the name of STFC nor the names of its contributors may be used to
 *     endorse or promote products derived from this software without specific
 *     prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef _CLASSIC_SRC_ALGORITHMS_POLYNOMIALTIMEDEPENDENCE_H_
#define _CLASSIC_SRC_ALGORITHMS_POLYNOMIALTIMEDEPENDENCE_H_
 
#include <vector>
#include <iostream>
#include "Algorithms/AbstractTimeDependence.h"
 
class Inform;
 
class PolynomialTimeDependence : public AbstractTimeDependence {
  public:
    PolynomialTimeDependence(std::vector<double> ptd) : coeffs(ptd) {}
 
    PolynomialTimeDependence() {}
    ~PolynomialTimeDependence() {}
    inline double getValue(double time);
    inline double getIntegral(double time);
    PolynomialTimeDependence* clone() {
      std::vector<double> temp(coeffs);
      PolynomialTimeDependence* d = new PolynomialTimeDependence(temp);
      return d;
    }
 
    Inform &print(Inform &os);
 
  private:
    std::vector<double> coeffs;
};
 
double PolynomialTimeDependence::getValue(double time) {
    double x = 0.;
    double t_power = 1.;
    for (std::size_t i = 0; i < coeffs.size() ; ++i) {
        x += coeffs[i]*t_power;
        t_power *= time;
    }
    return x;
}
 
double PolynomialTimeDependence::getIntegral(double time) {
    double result{};
    double t_power{time};
    for (std::size_t i = 0; i < coeffs.size() ; ++i) {
        result += coeffs[i] * t_power / (i + 1);
        t_power *= time;
    }
    return result;
}
 
 
inline
Inform &operator<<(Inform &os, PolynomialTimeDependence &p) {
  return p.print(os);
}
 
#endif