physics/src/G4RDLinLogLogInterpolation.cc

0001 //
0002 // ********************************************************************
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0018 // * This  code  implementation is the result of  the  scientific and *
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0022 // * use  in  resulting  scientific  publications,  and indicate your *
0023 // * acceptance of all terms of the Geant4 Software license.          *
0024 // ********************************************************************
0025 //
0026 //
0027 // Author:  Vladimir Ivanchenko (Vladimir.Ivantchenko@cern.ch)
0028 //
0029 // History:
0030 // -----------
0031 // 29 May 2002   VI        Created
0032 //
0033 // -------------------------------------------------------------------
0034
0035 #include "G4RDLinLogLogInterpolation.hh"
0036
0037 // Constructor
0038
0039 G4RDLinLogLogInterpolation::G4RDLinLogLogInterpolation()
0040 { }
0041
0042 // Destructor
0043
0044 G4RDLinLogLogInterpolation::~G4RDLinLogLogInterpolation()
0045 { }
0046
0047 G4RDVDataSetAlgorithm* G4RDLinLogLogInterpolation::Clone() const
0048 { return new G4RDLinLogLogInterpolation; }
0049
0050
0051 G4double G4RDLinLogLogInterpolation::Calculate(G4double x, G4int bin,
0052                       const G4DataVector& points,
0053                       const G4DataVector& data) const
0054 {
0055   G4int nBins = data.size() - 1;
0056   G4double value = 0.;
0057   if (x < points[0])
0058     {
0059       value = 0.;
0060     }
0061   else if (bin < nBins)
0062     {
0063       G4double e1 = points[bin];
0064       G4double e2 = points[bin+1];
0065       G4double d1 = data[bin];
0066       G4double d2 = data[bin+1];
0067       if(d1 > 0.0 && d2 > 0.0) {
0068         value = (std::log10(d1)*std::log10(e2/x) + std::log10(d2)*std::log10(x/e1)) / std::log10(e2/e1);
0069         value = std::pow(10.,value);
0070       } else {
0071         value = (d1*std::log10(e2/x) + d2*std::log10(x/e1)) / std::log10(e2/e1);
0072       }
0073     }
0074   else
0075     {
0076       value = data[nBins];
0077     }
0078
0079   return value;
0080 }