Geant4  10.03.p02
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G4ParticleHPArbitaryTab.cc
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25 //
26 // neutron_hp -- source file
27 // J.P. Wellisch, Nov-1996
28 // A prototype of the low energy neutron transport model.
29 //
30 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
31 //
33 #include "G4ios.hh"
34 
36  {
37  G4int i;
38  for(i=0;i<nDistFunc;i++)
39  {
40  if(anEnergy<theDistFunc[i].GetLabel()) break; // that is the energy we need
41  }
42  G4int low(0), high(0);
43  if(i==nDistFunc)
44  {
45  low = i-2;
46  high = i-1;
47  }
48  else if(i==0)
49  {
50  if(nDistFunc==0)
51  {
52  G4cerr << "No distribution functions to sample "
53  << "from in G4ParticleHPArbitaryTab::Sample"<<G4endl;
54  throw G4HadronicException(__FILE__, __LINE__, "nDistFunc==0");
55  }
56  else
57  {
58  return theDistFunc[0].Sample();
59  }
60  }
61  else
62  {
63  low = i-1;
64  high = i;
65  }
66  //************************************************************************
67  //EMendoza
68  /*
69  theBuffer.Merge(theManager.GetScheme(low), anEnergy,
70  theDistFunc+low, theDistFunc+high);
71  return theBuffer.Sample();
72  */
73  //************************************************************************
74  //New way to perform the 2D sampling:
75  G4double elow=theDistFunc[low].GetLabel();
76  G4double ehigh=theDistFunc[high].GetLabel();
77  G4double rval=(anEnergy-elow)/(ehigh-elow);//rval is 0 for elow and 1 for ehigh
78  G4double eoutlow=theLowThreshold[low]+rval*(theLowThreshold[high]-theLowThreshold[low]);
79  G4double eouthigh=theHighThreshold[low]+rval*(theHighThreshold[high]-theHighThreshold[low]);
80  G4double rand=G4UniformRand();
81  G4double Eout_1=0,Eout_2=0;
82  if(rval<rand){
83  Eout_1=theDistFunc[low].Sample();
84  Eout_2=eoutlow+(Eout_1-theLowThreshold[low])*(eouthigh-eoutlow)/(theHighThreshold[low]-theLowThreshold[low]);
85  }
86  else{
87  Eout_1=theDistFunc[high].Sample();
88  Eout_2=eoutlow+(Eout_1-theLowThreshold[high])*(eouthigh-eoutlow)/(theHighThreshold[high]-theLowThreshold[high]);
89  }
90  return Eout_2;
91 
92  //************************************************************************
93  }
int G4int
Definition: G4Types.hh:78
G4double Sample(G4double anEnergy)
#define G4UniformRand()
Definition: Randomize.hh:97
#define G4endl
Definition: G4ios.hh:61
double G4double
Definition: G4Types.hh:76
G4GLOB_DLL std::ostream G4cerr