#include <G4LogLogInterpolation.hh>

Inheritance diagram for G4LogLogInterpolation:

Public Member Functions
G4double	Calculate (G4double point, G4int bin, const G4DataVector &energies, const G4DataVector &data) const override

G4double	Calculate (G4double point, G4int bin, const G4DataVector &energies, const G4DataVector &data, const G4DataVector &log_energies, const G4DataVector &log_data) const override

virtual G4VDataSetAlgorithm *	Clone () const override

	G4LogLogInterpolation ()

	~G4LogLogInterpolation ()

Detailed Description

Definition at line 51 of file G4LogLogInterpolation.hh.

Constructor & Destructor Documentation

◆ G4LogLogInterpolation()

G4LogLogInterpolation::G4LogLogInterpolation ( )

explicit

Definition at line 46 of file G4LogLogInterpolation.cc.

47{ }

Referenced by Clone().

◆ ~G4LogLogInterpolation()

G4LogLogInterpolation::~G4LogLogInterpolation ( )

Definition at line 51 of file G4LogLogInterpolation.cc.

52{ }

Member Function Documentation

◆ Calculate() [1/2]

G4double G4LogLogInterpolation::Calculate	(	G4double	point,
		G4int	bin,
		const G4DataVector &	energies,
		const G4DataVector &	data
	)		const

overridevirtual

Implements G4VDataSetAlgorithm.

Definition at line 59 of file G4LogLogInterpolation.cc.

{
  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 = data[bin];
      G4double d2 = data[bin+1];
      // Check of e1, e2, d1 and d2 values to avoid floating-point errors when estimating the 
      // interpolated value below 
      if ((d1 > 0.) && (d2 > 0.) && (e1 > 0.) && (e2 > 0.))
        {
 
      value = std::log10(d1)+(std::log10(d2/d1)/std::log10(e2/e1)*std::log10(x/e1));
      value = std::pow(10.,value);
        }
      else value = 0.;
    }
  else
    {
      value = data[nBins];
    }
  return value;
}

References d1, d2, e1, and e2.

◆ Calculate() [2/2]

G4double G4LogLogInterpolation::Calculate	(	G4double	point,
		G4int	bin,
		const G4DataVector &	energies,
		const G4DataVector &	data,
		const G4DataVector &	log_energies,
		const G4DataVector &	log_data
	)		const

overridevirtual

Implements G4VDataSetAlgorithm.

Definition at line 95 of file G4LogLogInterpolation.cc.

{ 
  G4int nBins = data.size() - 1;
  G4double value = 0.;
  G4double log_x = std::log10(x);
  if (x < points[0])
    {
      value = 0.;
    }
  else if (bin < nBins)
    {
      G4double log_e1 = log_points[bin];
      G4double log_e2 = log_points[bin+1];
      G4double log_d1 = log_data[bin];
      G4double log_d2 = log_data[bin+1];
      
      // Values e1, e2, d1 and d2 are the log values of the corresponding
      // original energy and data values. Simple linear interpolation performed
      // on loagarithmic data should be equivalent to log-log interpolation
      value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
 
      // Delogarithmize to obtain interpolated value
      value = std::pow(10.,value);
   }
  else
    {
      value = data[nBins];
    }
  return value;
}