Geant4  10.03
G4SemiLogInterpolation.cc
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27 // $Id: G4SemiLogInterpolation.cc 66241 2012-12-13 18:34:42Z gunter $
28 //
29 // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
30 //
31 // History:
32 // -----------
33 // 31 Jul 2001 MGP Created
34 //
35 // -------------------------------------------------------------------
36 
38 
39 // Constructor
40 
42 { }
43 
44 
45 // Destructor
46 
48 { }
49 
51 { return new G4SemiLogInterpolation; }
52 
53 
55  const G4DataVector& points,
56  const G4DataVector& data) const
57 {
58  //G4cout << "G4SemiLogInterpolation is performed(2 arguments) " << G4endl;
59  G4int nBins = data.size() - 1;
60  G4double value = 0.;
61  if (x < points[0])
62  {
63  value = 0.;
64  }
65  else if (bin < nBins)
66  {
67  G4double e1 = points[bin];
68  G4double e2 = points[bin+1];
69  G4double d1 = data[bin];
70  G4double d2 = data[bin+1];
71  value = (d1*std::log10(e2/x) + d2*std::log10(x/e1)) / std::log10(e2/e1);
72  }
73  else
74  {
75  value = data[nBins];
76  }
77  return value;
78 }
79 
81  const G4DataVector& points,
82  const G4DataVector& data,
83  const G4DataVector& log_points,
84  const G4DataVector& /*log_data*/) const
85 {
86 //A combination of logarithmic interpolation on energy set and
87 //linear Interpolation on data set
88  //G4cout << "G4SemiLogInterpolation is performed (4 arguments)" << G4endl;
89  G4int nBins = data.size() - 1;
90  G4double value = 0.;
91  G4double log_x = std::log10(x);
92  if (x < points[0])
93  {
94  value = 0.;
95  }
96  else if (bin < nBins)
97  {
98  G4double e1 = points[bin];
99  G4double e2 = points[bin+1];
100  G4double d1 = data[bin];
101  G4double d2 = data[bin+1];
102  G4double log_e1 = log_points[bin];
103  G4double log_e2 = log_points[bin+1];
104  //G4double log_d1 = log_data[bin];
105  //G4double log_d2 = log_data[bin+1];
106  //G4cout << "x = " << x << " , log_x = " << log_x << " , bin = " << bin << G4endl;
107  //G4cout << "e1 = " << e1 << " , d1 = " << d1 << G4endl;
108  //G4cout << "e2 = " << e2 << " , d2 = " << d2 << G4endl;
109 // Values log_e1 and log_e2 are the log values of the corresponding
110 // original energy actual values. Original d1 and d2 values are used.
111 // Simple linear interpolation performed on loagarithmic data
112 // should be equivalent to semi log-log interpolation
113  if (e1 == 0.0) log_e1 = -300;
114  if (e2 == 0.0) log_e2 = -300;
115  value = d1 + (d2 - d1)*(log_x - log_e1)/(log_e2 - log_e1);
116  //G4cout << "G4SemiLogInterpolation - Final Interpolated Value: " << value << G4endl << G4endl;
117  }
118  else
119  {
120  value = data[nBins];
121  }
122  return value;
123 }
124 
G4double Calculate(G4double point, G4int bin, const G4DataVector &energies, const G4DataVector &data) const
static const G4double d2
int G4int
Definition: G4Types.hh:78
virtual G4VDataSetAlgorithm * Clone() const
static const G4double d1
double G4double
Definition: G4Types.hh:76