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G4ParticleHPInterpolator.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 //
32 #include "G4ParticleHPInterpolator.hh"
33 #include "G4Pow.hh"
34 
35  G4double G4ParticleHPInterpolator::
36  GetBinIntegral(const G4InterpolationScheme & aScheme,
37  const G4double x1,const G4double x2,const G4double y1,const G4double y2)
38  { // inline again later on @@@@
39  G4double result = 0;
40  if(aScheme==HISTO||aScheme==CHISTO||aScheme==UHISTO)
41  {
42  result = y1*(x2-x1);
43  }
44  else if(aScheme==LINLIN||aScheme==CLINLIN||aScheme==ULINLIN)
45  {
46  result = 0.5*(y2+y1)*(x2-x1);
47  }
48  else if(aScheme==LINLOG||aScheme==CLINLOG||aScheme==ULINLOG)
49  {
50  if(x1==0) result = y1;
51  else if(x2==0) result = y2;
52  else
53  {
54  G4double b = (y2-y1)/(G4Log(x2)-G4Log(x1));
55  G4double a = y1 - b*G4Log(x1);
56  result = (a-b)*(x2-x1) + b*(x2*G4Log(x2)-x1*G4Log(x1));
57  }
58  }
59  else if(aScheme==LOGLIN||aScheme==CLOGLIN||aScheme==ULOGLIN)
60  {
61  if ( y1==0||y2==0 ) {
62  result =0;
63  } else {
64  // G4double b = (std::log(y2)-std::log(y1))/(x2-x1);
65  // G4double a = std::log(y1) - b*x1;
66  //***************************************************************
67  //EMendoza:
68  //result = (std::exp(a)/b)*(std::exp(b*x2)-std::exp(b*x1));
69  //***************************************************************
70  if ( y1!=y2 ) {
71  result = (x2-x1)*(y2-y1)/G4Log(y2/y1);
72  } else {
73  result = y2*(x2-x1);
74  }
75  //***************************************************************
76  }
77  }
78  else if(aScheme==LOGLOG||aScheme==CLOGLOG||aScheme==ULOGLOG)
79  {
80  if(x1==0) result = y1;
81  else if(x2==0) result = y2;
82  else if(y1==0||y2==0) result =0;
83  else
84  {
85  G4double b = (G4Log(y2)-G4Log(y1))/(G4Log(x2)-G4Log(x1));
86  G4double a = G4Log(y1) - b*G4Log(x1);;
87  result = (G4Exp(a)/(b+1))*(G4Pow::GetInstance()->powA(x2,b+1)-G4Pow::GetInstance()->powA(x1,b+1));
88  }
89  }
90  else
91  {
92  throw G4HadronicException(__FILE__, __LINE__, "Unknown interpolation scheme in G4ParticleHPVector::Integrate");
93  }
94  return result;
95  }
96  G4double G4ParticleHPInterpolator::
97  GetWeightedBinIntegral(const G4InterpolationScheme & aScheme,
98  const G4double x1,const G4double x2,const G4double y1,const G4double y2)
99  { // inline again later on @@@@
100  G4double result = 0;
101  if(aScheme==HISTO||aScheme==CHISTO||aScheme==UHISTO)
102  {
103  result = 0.5*y1*(x2*x2-x1*x1);
104  }
105  else if(aScheme==LINLIN||aScheme==CLINLIN||aScheme==ULINLIN)
106  {
107  // G4double b = (y2-y1)/(x2-x1);
108  // G4double a = y1 - b*x1;
109  // result = 0.5*a*(x2*x2-x1*x1) + (b/3.)*(x2*x2*x2-x1*x1*x1);
110  // Factor out x2-x1 to avoid divide by zero
111 
112  result = (y1*x2 - y2*x1)*(x2 + x1)/2. + (y2-y1)*(x2*x2 + x2*x1 + x1*x1)/3.;
113  }
114  else if(aScheme==LINLOG||aScheme==CLINLOG||aScheme==ULINLOG)
115  {
116  if(x1==0) result = y1;
117  else if(x2==0) result = y2;
118  else
119  {
120  G4double b = (y2-y1)/(G4Log(x2)-G4Log(x1));
121  G4double a = y1 - b*G4Log(x1);
122  result = ( x2*x2/2. * (a-b/2.+b*G4Log(x2)) )
123  -( x1*x1/2. * (a-b/2.+b*G4Log(x1)) );
124  }
125  }
126  else if(aScheme==LOGLIN||aScheme==CLOGLIN||aScheme==ULOGLIN)
127  {
128  if(y1==0||y2==0) result = 0;
129  else
130  {
131  G4double b = (G4Log(y2)-G4Log(y1))/(x2-x1);
132  G4double a = G4Log(y1) - b*x1;
133  result = G4Exp(a)/(b*b)*( G4Exp(b*x2)*(b*x2-1.) - G4Exp(b*x1)*(b*x1-1.) );
134  }
135  }
136  else if(aScheme==LOGLOG||aScheme==CLOGLOG||aScheme==ULOGLOG)
137  {
138  if(x1==0) result = y1;
139  else if(x2==0) result = y2;
140  else if(y1==0||y2==0) result = 0;
141  else
142  {
143  G4double b = (G4Log(y2)-G4Log(y1))/(G4Log(x2)-G4Log(x1));
144  G4double a = G4Log(y1) - b*G4Log(x1);;
145  result = G4Exp(a)/(b+2.)*( G4Pow::GetInstance()->powA(x2, b+2.) - G4Pow::GetInstance()->powA(x1, b+2) );
146  }
147  }
148  else
149  {
150  throw G4HadronicException(__FILE__, __LINE__, "Unknown interpolation scheme in G4ParticleHPVector::Integrate");
151  }
152  return result;
153  }