ChebyshevPolynomial.cxx

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/*
  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
*/
 
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// 07.04.2005, AUTHOR: OLIVER KORTNER
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
// IMPLEMENTATION OF THE CLASS ChebyshevPolynomial //
 
#include "MuonCalibMath/ChebyshevPolynomial.h"
 
namespace MuonCalib {
 
//*****************************************************************************
 
// METHOD value //
 
  double ChebyshevPolynomial::value(const int & order, const double & x) const {
 
    switch(order) {
    case 0:
      return 1;
      break;
    case 1:
      return x;
      break;
    case 2:
    default:
      return 2.0*x*value(order-1, x) - value(order-2, x);
      break;
    }
 
  }
 
}