G4RDLinLogInterpolation.cc

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//
//
//
// Author:  Vladimir Ivanchenko (Vladimir.Ivantchenko@cern.ch)
//
// History:
// -----------
// 27 May 2002   VI        Created
//
// -------------------------------------------------------------------

#include "G4RDLinLogInterpolation.hh"

// Constructor

G4RDLinLogInterpolation::G4RDLinLogInterpolation()
{ }


// Destructor

G4RDLinLogInterpolation::~G4RDLinLogInterpolation()
{ }


G4double G4RDLinLogInterpolation::Calculate(G4double x, G4int bin, 
            const G4DataVector& points, 
            const G4DataVector& data) const
{
  G4int nBins = data.size() - 1;
  G4double value = 0.;
  if (x < points[0])
    {
      value = 0.;
    }
  else if (bin < nBins)
    {
      G4double e1 = points[bin];
      G4double e2 = points[bin+1];
      G4double d1 = std::log(data[bin]);
      G4double d2 = std::log(data[bin+1]);
      value = std::exp(d1 + (d2 - d1)*(x - e1)/ (e2 - e1));
    }
  else
    {
      value = data[nBins];
    }
  return value;
}