1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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16 | // * for the full disclaimer and the limitation of liability. * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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22 | // * use in resulting scientific publications, and indicate your * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // neutron_hp -- source file |
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27 | // J.P. Wellisch, Nov-1996 |
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28 | // A prototype of the low energy neutron transport model. |
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29 | // |
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30 | #include "G4NeutronHPInterpolator.hh" |
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31 | |
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32 | G4double G4NeutronHPInterpolator:: |
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33 | GetBinIntegral(const G4InterpolationScheme & aScheme, |
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34 | const G4double x1,const G4double x2,const G4double y1,const G4double y2) |
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35 | { // inline again later on @@@@ |
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36 | G4double result = 0; |
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37 | if(aScheme==HISTO||aScheme==CHISTO||aScheme==UHISTO) |
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38 | { |
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39 | result = y1*(x2-x1); |
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40 | } |
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41 | else if(aScheme==LINLIN||aScheme==CLINLIN||aScheme==ULINLIN) |
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42 | { |
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43 | result = 0.5*(y2+y1)*(x2-x1); |
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44 | } |
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45 | else if(aScheme==LINLOG||aScheme==CLINLOG||aScheme==ULINLOG) |
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46 | { |
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47 | if(x1==0) result = y1; |
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48 | else if(x2==0) result = y2; |
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49 | else |
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50 | { |
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51 | G4double b = (y2-y1)/(std::log(x2)-std::log(x1)); |
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52 | G4double a = y1 - b*std::log(x1); |
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53 | result = (a-b)*(x2-x1) + b*(x2*std::log(x2)-x1*std::log(x1)); |
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54 | } |
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55 | } |
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56 | else if(aScheme==LOGLIN||aScheme==CLOGLIN||aScheme==ULOGLIN) |
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57 | { |
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58 | if(y1==0||y2==0) result =0; |
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59 | else |
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60 | { |
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61 | G4double b = (std::log(y2)-std::log(y1))/(x2-x1); |
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62 | G4double a = std::log(y1) - b*x1; |
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63 | result = (std::exp(a)/b)*(std::exp(b*x2)-std::exp(b*x1)); |
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64 | } |
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65 | } |
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66 | else if(aScheme==LOGLOG||aScheme==CLOGLOG||aScheme==ULOGLOG) |
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67 | { |
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68 | if(x1==0) result = y1; |
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69 | else if(x2==0) result = y2; |
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70 | else if(y1==0||y2==0) result =0; |
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71 | else |
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72 | { |
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73 | G4double b = (std::log(y2)-std::log(y1))/(std::log(x2)-std::log(x1)); |
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74 | G4double a = std::log(y1) - b*std::log(x1);; |
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75 | result = (std::exp(a)/(b+1))*(std::pow(x2,b+1)-std::pow(x1,b+1)); |
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76 | } |
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77 | } |
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78 | else |
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79 | { |
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80 | throw G4HadronicException(__FILE__, __LINE__, "Unknown interpolation scheme in G4NeutronHPVector::Integrate"); |
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81 | } |
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82 | return result; |
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83 | } |
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84 | G4double G4NeutronHPInterpolator:: |
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85 | GetWeightedBinIntegral(const G4InterpolationScheme & aScheme, |
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86 | const G4double x1,const G4double x2,const G4double y1,const G4double y2) |
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87 | { // inline again later on @@@@ |
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88 | G4double result = 0; |
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89 | if(aScheme==HISTO||aScheme==CHISTO||aScheme==UHISTO) |
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90 | { |
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91 | result = 0.5*y1*(x2*x2-x1*x1); |
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92 | } |
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93 | else if(aScheme==LINLIN||aScheme==CLINLIN||aScheme==ULINLIN) |
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94 | { |
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95 | // G4double b = (y2-y1)/(x2-x1); |
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96 | // G4double a = y1 - b*x1; |
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97 | // result = 0.5*a*(x2*x2-x1*x1) + (b/3.)*(x2*x2*x2-x1*x1*x1); |
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98 | // Factor out x2-x1 to avoid divide by zero |
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99 | |
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100 | result = (y1*x2 - y2*x1)*(x2 + x1)/2. + (y2-y1)*(x2*x2 + x2*x1 + x1*x1)/3.; |
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101 | } |
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102 | else if(aScheme==LINLOG||aScheme==CLINLOG||aScheme==ULINLOG) |
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103 | { |
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104 | if(x1==0) result = y1; |
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105 | else if(x2==0) result = y2; |
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106 | else |
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107 | { |
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108 | G4double b = (y2-y1)/(std::log(x2)-std::log(x1)); |
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109 | G4double a = y1 - b*std::log(x1); |
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110 | result = ( x2*x2/2. * (a-b/2.+b*std::log(x2)) ) |
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111 | -( x1*x1/2. * (a-b/2.+b*std::log(x1)) ); |
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112 | } |
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113 | } |
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114 | else if(aScheme==LOGLIN||aScheme==CLOGLIN||aScheme==ULOGLIN) |
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115 | { |
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116 | if(y1==0||y2==0) result = 0; |
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117 | else |
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118 | { |
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119 | G4double b = (std::log(y2)-std::log(y1))/(x2-x1); |
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120 | G4double a = std::log(y1) - b*x1; |
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121 | result = std::exp(a)/(b*b)*( std::exp(b*x2)*(b*x2-1.) - std::exp(b*x1)*(b*x1-1.) ); |
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122 | } |
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123 | } |
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124 | else if(aScheme==LOGLOG||aScheme==CLOGLOG||aScheme==ULOGLOG) |
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125 | { |
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126 | if(x1==0) result = y1; |
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127 | else if(x2==0) result = y2; |
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128 | if(y1==0||y2==0) result = 0; |
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129 | else |
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130 | { |
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131 | G4double b = (std::log(y2)-std::log(y1))/(std::log(x2)-std::log(x1)); |
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132 | G4double a = std::log(y1) - b*std::log(x1);; |
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133 | result = std::exp(a)/(b+2.)*( std::pow(x2, b+2.) - std::pow(x1, b+2) ); |
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134 | } |
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135 | } |
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136 | else |
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137 | { |
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138 | throw G4HadronicException(__FILE__, __LINE__, "Unknown interpolation scheme in G4NeutronHPVector::Integrate"); |
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139 | } |
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140 | return result; |
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141 | } |
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