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G4LogLogInterpolation Class Reference

#include <G4LogLogInterpolation.hh>

Inheritance diagram for G4LogLogInterpolation:
Collaboration diagram for G4LogLogInterpolation:

Public Member Functions

 G4LogLogInterpolation ()
 
 ~G4LogLogInterpolation ()
 
G4double Calculate (G4double point, G4int bin, const G4DataVector &energies, const G4DataVector &data) const
 
G4double Calculate (G4double point, G4int bin, const G4DataVector &energies, const G4DataVector &data, const G4DataVector &log_energies, const G4DataVector &log_data) const
 
virtual G4VDataSetAlgorithmClone () const
 
- Public Member Functions inherited from G4VDataSetAlgorithm
 G4VDataSetAlgorithm ()
 
virtual ~G4VDataSetAlgorithm ()
 

Detailed Description

Definition at line 53 of file G4LogLogInterpolation.hh.

Constructor & Destructor Documentation

G4LogLogInterpolation::G4LogLogInterpolation ( )

Definition at line 45 of file G4LogLogInterpolation.cc.

46 { }

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G4LogLogInterpolation::~G4LogLogInterpolation ( )

Definition at line 50 of file G4LogLogInterpolation.cc.

51 { }

Member Function Documentation

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

Implements G4VDataSetAlgorithm.

Definition at line 57 of file G4LogLogInterpolation.cc.

60 {
61  //G4cout << "G4LogLogInterpolation is performed (2 arguments) " << G4endl;
62  G4int nBins = data.size() - 1;
63 //G4double oldresult = 0.;
64  G4double value = 0.;
65  if (x < points[0])
66  {
67  value = 0.;
68  }
69  else if (bin < nBins)
70  {
71  G4double e1 = points[bin];
72  G4double e2 = points[bin+1];
73  G4double d1 = data[bin];
74  G4double d2 = data[bin+1];
75 // Check of e1, e2, d1 and d2 values to avoid floating-point errors when estimating the interpolated value below -- S.I., Jun. 2008
76  if ((d1 > 0.) && (d2 > 0.) && (e1 > 0.) && (e2 > 0.))
77  {
78 // Streamline the Log-Log Interpolation formula in order to reduce the required number of log10() function calls
79 // Variable oldresult contains the result of old implementation of Log-Log interpolation -- M.G.P. Jun. 2001
80 // oldresult = (std::log10(d1)*std::log10(e2/x) + std::log10(d2)*std::log10(x/e1)) / std::log10(e2/e1);
81 // oldresult = std::pow(10.,oldresult);
82 // Variable value contains the result of new implementation, after streamlining the math operation -- N.A.K. Oct. 2008
83  value = std::log10(d1)+(std::log10(d2/d1)/std::log10(e2/e1)*std::log10(x/e1));
84  value = std::pow(10.,value);
85 // Test of the new implementation result (value variable) against the old one (oldresult) -- N.A.K. Dec. 2008
86 // G4double diffResult = value - oldresult;
87 // G4double relativeDiff = 1e-11;
88 // Comparison of the two values based on a max allowable relative difference
89 // if ( std::fabs(diffResult) > relativeDiff*std::fabs(oldresult) )
90 // {
91 // Abort comparison when at least one of two results is infinite
92 // if ((!std::isinf(oldresult)) && (!std::isinf(value)))
93 // {
94 // G4cout << "G4LogLogInterpolation> Old Interpolated Value is:" << oldresult << G4endl;
95 // G4cout << "G4LogLogInterpolation> New Interpolated Value is:" << value << G4endl << G4endl;
96 // G4cerr << "G4LogLogInterpolation> Error in Interpolation:" << G4endl;
97 // G4cerr << "The difference between new and old interpolated value is:" << diffResult << G4endl << G4endl;
98 // }
99 // }
100  }
101  else value = 0.;
102  }
103  else
104  {
105  value = data[nBins];
106  }
107  return value;
108 }
static const G4double d2
int G4int
Definition: G4Types.hh:78
const XML_Char int const XML_Char * value
Definition: expat.h:331
static const G4double d1
double G4double
Definition: G4Types.hh:76
G4double G4LogLogInterpolation::Calculate ( G4double  point,
G4int  bin,
const G4DataVector energies,
const G4DataVector data,
const G4DataVector log_energies,
const G4DataVector log_data 
) const
virtual

Implements G4VDataSetAlgorithm.

Definition at line 114 of file G4LogLogInterpolation.cc.

119 {
120  //G4cout << "G4LogLogInterpolation is performed (4 arguments) " << G4endl;
121  G4int nBins = data.size() - 1;
122  G4double value = 0.;
123  G4double log_x = std::log10(x);
124  if (x < points[0])
125  {
126  value = 0.;
127  }
128  else if (bin < nBins)
129  {
130  G4double log_e1 = log_points[bin];
131  G4double log_e2 = log_points[bin+1];
132  G4double log_d1 = log_data[bin];
133  G4double log_d2 = log_data[bin+1];
134 
135  //G4cout << "x = " << x << " , logx = " << log_x << " , bin = " << bin << G4endl;
136  //G4cout << "e1 = " << points[bin] << " d1 = " << data[bin] << G4endl;
137  //G4cout << "e2 = " << points[bin+1] << " d2 = " << data[bin+1] << G4endl;
138  //G4cout << "loge1 = " << log_e1 << " logd1 = " << log_d1 << G4endl;
139  //G4cout << "loge2 = " << log_e2 << " logd2 = " << log_d2 << G4endl;
140 
141 // Values e1, e2, d1 and d2 are the log values of the corresponding
142 // original energy and data values. Simple linear interpolation performed
143 // on loagarithmic data should be equivalent to log-log interpolation
144  value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
145 
146 // Delogarithmize to obtain interpolated value
147  value = std::pow(10.,value);
148  }
149  else
150  {
151  value = data[nBins];
152  }
153  return value;
154 }
int G4int
Definition: G4Types.hh:78
const XML_Char int const XML_Char * value
Definition: expat.h:331
double G4double
Definition: G4Types.hh:76
G4VDataSetAlgorithm * G4LogLogInterpolation::Clone ( ) const
virtual

Implements G4VDataSetAlgorithm.

Definition at line 53 of file G4LogLogInterpolation.cc.

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The documentation for this class was generated from the following files: