Geant4  10.03.p03
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G4INCLInterpolationTable.cc
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25 //
26 // INCL++ intra-nuclear cascade model
27 // Alain Boudard, CEA-Saclay, France
28 // Joseph Cugnon, University of Liege, Belgium
29 // Jean-Christophe David, CEA-Saclay, France
30 // Pekka Kaitaniemi, CEA-Saclay, France, and Helsinki Institute of Physics, Finland
31 // Sylvie Leray, CEA-Saclay, France
32 // Davide Mancusi, CEA-Saclay, France
33 //
34 #define INCLXX_IN_GEANT4_MODE 1
35 
36 #include "globals.hh"
37 
45 // #include <cassert>
46 #include <algorithm>
47 #include <functional>
49 
50 namespace G4INCL {
51 
53 
54  InterpolationTable::InterpolationTable(std::vector<G4double> const &x, std::vector<G4double> const &y)
55  : IFunction1D(x.front(), x.back())
56  {
57 // assert(x.size()==y.size());
58  // Assert that the x vector is sorted
59 // assert(std::adjacent_find(nodes.begin(), nodes.end(), std::greater<InterpolationNode>()) == nodes.end());
60 
61  for(unsigned i = 0; i < x.size(); ++i)
62  nodes.push_back(InterpolationNode(x.at(i), y.at(i), 0.));
63 
65  }
66 
67  std::vector<G4double> InterpolationTable::getNodeAbscissae() const {
68  std::vector<G4double> x(nodes.size());
69  std::transform(nodes.begin(), nodes.end(), x.begin(),
70  std::mem_fun_ref(&InterpolationNode::getX));
71  return x;
72  }
73 
74  std::vector<G4double> InterpolationTable::getNodeValues() const {
75  std::vector<G4double> y(nodes.size());
76  std::transform(nodes.begin(), nodes.end(), y.begin(),
77  std::mem_fun_ref(&InterpolationNode::getY));
78  return y;
79  }
80 
82  for(unsigned i = 0; i < nodes.size()-1; i++) {
83  if((nodes.at(i+1).getX() - nodes.at(i).getX()) == 0.0) // Safeguard against division by zero
84  nodes[i].setYPrime(0.0);
85  else
86  nodes[i].setYPrime((nodes.at(i+1).getY() - nodes.at(i).getY())/(nodes.at(i+1).getX() - nodes.at(i).getX()));
87  }
88  nodes.back().setYPrime(nodes.at(nodes.size()-2).getYPrime()); // Duplicate the last value
89  }
90 
92  // Find the relevant interpolation bin
93  InterpolationNode xNode(x,0.,0.);
94  std::vector<InterpolationNode>::const_iterator iter =
95  std::lower_bound(nodes.begin(), nodes.end(), xNode);
96 
97  if(iter==nodes.begin())
98  return nodes.front().getY();
99 
100  if(iter==nodes.end())
101  return nodes.back().getY();
102 
103  std::vector<InterpolationNode>::const_iterator previousIter = iter - 1;
104  const G4double dx = x - previousIter->getX();
105  return previousIter->getY() + previousIter->getYPrime()*dx;
106  }
107 
108  std::string InterpolationTable::print() const {
109  std::string message;
110  for(std::vector<InterpolationNode>::const_iterator n=nodes.begin(), e=nodes.end(); n!=e; ++n)
111  message += n->print();
112  return message;
113  }
114 
115 }
void initDerivatives()
Initialise the values of the node derivatives.
Simple interpolation table.
tuple x
Definition: test.py:50
std::vector< G4double > getNodeAbscissae() const
const G4int n
G4double operator()(const G4double x) const
Compute the value of the function.
std::vector< G4double > getNodeValues() const
double G4double
Definition: G4Types.hh:76
std::vector< InterpolationNode > nodes
Interpolating nodes.