physics/src/G4RDLogLogInterpolation.cc

0001 //
0002 // ********************************************************************
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0024 // ********************************************************************
0025 //
0026 //
0027 //
0028 // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
0029 //
0030 // History:
0031 // -----------
0032 // 31 Jul 2001   MGP        Created
0033 //
0034 // -------------------------------------------------------------------
0035
0036 #include "G4RDLogLogInterpolation.hh"
0037
0038 // Constructor
0039
0040 G4RDLogLogInterpolation::G4RDLogLogInterpolation()
0041 { }
0042
0043 // Destructor
0044
0045 G4RDLogLogInterpolation::~G4RDLogLogInterpolation()
0046 { }
0047
0048 G4RDVDataSetAlgorithm* G4RDLogLogInterpolation::Clone() const
0049 { return new G4RDLogLogInterpolation; }
0050
0051
0052 G4double G4RDLogLogInterpolation::Calculate(G4double x, G4int bin,
0053                       const G4DataVector& points,
0054                       const G4DataVector& data) const
0055 {
0056   G4int nBins = data.size() - 1;
0057   G4double value = 0.;
0058   if (x < points[0])
0059     {
0060       value = 0.;
0061     }
0062   else if (bin < nBins)
0063     {
0064       G4double e1 = points[bin];
0065       G4double e2 = points[bin+1];
0066       G4double d1 = data[bin];
0067       G4double d2 = data[bin+1];
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     }
0071   else
0072     {
0073       value = data[nBins];
0074     }
0075
0076   return value;
0077 }