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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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18 | // * This code implementation is the result of the scientific and * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4PhysicsVector.icc,v 1.14 2008/09/05 18:04:45 vnivanch Exp $ |
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28 | // GEANT4 tag $Name: HEAD $ |
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29 | // |
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30 | // |
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31 | //--------------------------------------------------------------- |
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32 | // GEANT 4 class source file |
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33 | // |
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34 | // G4PhysicsVector.icc |
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35 | // |
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36 | // Description: |
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37 | // A physics vector which has values of energy-loss, cross-section, |
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38 | // and other physics values of a particle in matter in a given |
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39 | // range of the energy, momentum, etc. |
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40 | // This class serves as the base class for a vector having various |
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41 | // energy scale, for example like 'log', 'linear', 'free', etc. |
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42 | // |
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43 | // Modified: |
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44 | // 05 Sep. 2008, V.Ivanchenko : added protections for zero-length vector |
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45 | //--------------------------------------------------------------- |
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46 | |
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47 | inline |
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48 | G4double G4PhysicsVector::operator[](const size_t binNumber) const |
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49 | { |
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50 | return dataVector[binNumber]; |
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51 | } |
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52 | |
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53 | //--------------------------------------------------------------- |
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54 | |
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55 | inline |
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56 | G4double G4PhysicsVector::operator()(const size_t binNumber) const |
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57 | { |
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58 | return dataVector[binNumber]; |
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59 | } |
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60 | |
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61 | //--------------------------------------------------------------- |
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62 | |
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63 | inline |
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64 | size_t G4PhysicsVector::GetVectorLength() const |
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65 | { |
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66 | return numberOfBin; |
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67 | } |
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68 | |
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69 | //--------------------------------------------------------------- |
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70 | |
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71 | inline |
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72 | G4double G4PhysicsVector::LinearInterpolation() |
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73 | { |
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74 | // Linear interpolation is used to get the value. If the give energy |
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75 | // is in the highest bin, no interpolation will be Done. Because |
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76 | // there is an extra bin hidden from a user at locBin=numberOfBin, |
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77 | // the following interpolation is valid even the current locBin= |
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78 | // numberOfBin-1. |
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79 | |
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80 | G4double intplFactor = (lastEnergy-binVector[lastBin]) |
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81 | / (binVector[lastBin+1]-binVector[lastBin]); // Interpolation factor |
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82 | |
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83 | return dataVector[lastBin] + |
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84 | ( dataVector[lastBin+1]-dataVector[lastBin] ) * intplFactor; |
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85 | } |
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86 | |
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87 | //--------------------------------------------------------------- |
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88 | |
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89 | inline |
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90 | G4double G4PhysicsVector::SplineInterpolation() |
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91 | { |
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92 | // Spline interpolation is used to get the value. If the give energy |
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93 | // is in the highest bin, no interpolation will be Done. Because |
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94 | // there is an extra bin hidden from a user at locBin=numberOfBin, |
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95 | // the following interpolation is valid even the current locBin= |
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96 | // numberOfBin-1. |
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97 | |
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98 | if( !secDerivative ) { FillSecondDerivatives(); } |
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99 | |
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100 | // check bin value |
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101 | G4double delta = binVector[lastBin+1] - binVector[lastBin]; |
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102 | |
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103 | G4double a = (binVector[lastBin+1] - lastEnergy)/delta; |
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104 | G4double b = (lastEnergy - binVector[lastBin])/delta; |
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105 | |
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106 | // Final evaluation of cubic spline polynomial for return |
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107 | G4double y1 = dataVector[lastBin]; |
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108 | G4double y2 = dataVector[lastBin+1]; |
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109 | |
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110 | G4double res = a*y1 + b*y2 + |
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111 | ((a*a*a - a)*secDerivative[lastBin] + |
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112 | (b*b*b - b)*secDerivative[lastBin+1])*delta*delta/6.0 ; |
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113 | |
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114 | return res; |
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115 | } |
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116 | |
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117 | //--------------------------------------------------------------- |
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118 | |
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119 | inline |
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120 | G4double G4PhysicsVector::GetValue(G4double theEnergy, G4bool&) |
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121 | { |
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122 | // Use cache for speed up - check if the value 'theEnergy' is same as the |
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123 | // last call. If it is same, then use the last bin location. Also the |
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124 | // value 'theEnergy' lies between the last energy and low edge of of the |
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125 | // bin of last call, then the last bin location is used. |
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126 | |
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127 | if( theEnergy == lastEnergy ) { |
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128 | |
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129 | } else if( theEnergy <= edgeMin ) { |
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130 | lastBin = 0; |
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131 | lastEnergy = theEnergy; |
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132 | lastValue = dataVector[0]; |
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133 | |
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134 | } else if(theEnergy < lastEnergy && theEnergy >= binVector[lastBin]) { |
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135 | lastEnergy = theEnergy; |
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136 | Interpolation(); |
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137 | |
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138 | } else if(theEnergy < lastEnergy && theEnergy >= binVector[lastBin-1]) { |
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139 | lastBin--; |
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140 | lastEnergy = theEnergy; |
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141 | Interpolation(); |
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142 | |
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143 | } else if( theEnergy >= edgeMax ){ |
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144 | lastBin = numberOfBin-1; |
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145 | lastEnergy = edgeMax; |
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146 | lastValue = dataVector[lastBin]; |
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147 | |
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148 | } else { |
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149 | lastBin = FindBinLocation(theEnergy); |
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150 | lastEnergy = theEnergy; |
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151 | Interpolation(); |
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152 | } |
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153 | return lastValue; |
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154 | } |
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155 | |
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156 | //--------------------------------------------------------------- |
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157 | |
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158 | inline |
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159 | void G4PhysicsVector::Interpolation() |
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160 | { |
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161 | if(useSpline) { lastValue = SplineInterpolation(); } |
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162 | else { lastValue = LinearInterpolation(); } |
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163 | } |
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164 | |
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165 | //--------------------------------------------------------------- |
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166 | |
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167 | inline |
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168 | void G4PhysicsVector::PutValue(size_t binNumber, G4double theValue) |
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169 | { |
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170 | if(binNumber < numberOfBin) { |
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171 | dataVector[binNumber] = theValue; |
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172 | |
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173 | // Fill the bin which is hidden to user with theValue. This is to |
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174 | // handle correctly when Energy=theEmax in getValue. |
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175 | |
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176 | if(binNumber==numberOfBin-1) { dataVector[binNumber+1] = theValue; } |
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177 | } |
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178 | } |
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179 | |
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180 | //--------------------------------------------------------------- |
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181 | |
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182 | inline |
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183 | G4bool G4PhysicsVector::IsFilledVectorExist() const |
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184 | { |
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185 | G4bool status=false; |
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186 | |
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187 | if(numberOfBin > 0) { status=true; } |
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188 | return status; |
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189 | } |
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190 | |
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191 | //--------------------------------------------------------------- |
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192 | |
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193 | inline |
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194 | void G4PhysicsVector::PutComment(const G4String& theComment) |
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195 | { |
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196 | comment = theComment; |
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197 | } |
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198 | |
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199 | //--------------------------------------------------------------- |
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200 | |
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201 | inline |
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202 | const G4String& G4PhysicsVector::GetComment() const |
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203 | { |
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204 | return comment; |
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205 | } |
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206 | |
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207 | //--------------------------------------------------------------- |
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208 | |
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209 | inline |
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210 | G4PhysicsVectorType G4PhysicsVector::GetType() const |
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211 | { |
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212 | return type; |
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213 | } |
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214 | |
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215 | //--------------------------------------------------------------- |
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216 | |
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217 | inline |
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218 | void G4PhysicsVector::SetSpline(G4bool val) |
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219 | { |
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220 | useSpline = val; |
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221 | } |
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