1 | ////////////////////////////////////////////////////////////////////////// |
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2 | // SimpleVector.icc |
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3 | ////////////////////////////////////////////////////////////////////////// |
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4 | |
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5 | ////////////////////////////////////////////////////////////////////////// |
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6 | // garren@fnal.gov, July 2006 |
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7 | // |
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8 | // |
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9 | ////////////////////////////////////////////////////////////////////////// |
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10 | |
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11 | #include <cmath> |
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12 | #include <algorithm> // for swap |
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13 | |
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14 | namespace HepMC { |
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15 | |
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16 | ////////////////////////////////////////////////////////////////////////// |
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17 | // FourVector inline methods |
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18 | ////////////////////////////////////////////////////////////////////////// |
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19 | |
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20 | inline void FourVector::swap( FourVector & other ) { |
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21 | std::swap( m_x, other.m_x ); |
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22 | std::swap( m_y, other.m_y ); |
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23 | std::swap( m_z, other.m_z ); |
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24 | std::swap( m_t, other.m_t ); |
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25 | } |
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26 | |
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27 | inline FourVector & FourVector::operator=(const FourVector & v) { |
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28 | m_x = v.x(); |
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29 | m_y = v.y(); |
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30 | m_z = v.z(); |
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31 | m_t = v.t(); |
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32 | return *this; |
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33 | } |
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34 | |
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35 | inline void FourVector::set(double xin, double yin, double zin, double tin) { |
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36 | m_x = xin; |
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37 | m_y = yin; |
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38 | m_z = zin; |
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39 | m_t = tin; |
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40 | } |
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41 | |
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42 | inline double FourVector::m2() const { |
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43 | return m_t*m_t - (m_x*m_x + m_y*m_y + m_z*m_z); |
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44 | } |
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45 | |
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46 | inline double FourVector::m() const { |
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47 | double mm = m2(); |
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48 | return mm < 0.0 ? -std::sqrt(-mm) : std::sqrt(mm); |
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49 | } |
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50 | |
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51 | inline double FourVector::perp2() const { return m_x*m_x + m_y*m_y; } |
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52 | |
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53 | inline double FourVector::perp() const { return std::sqrt(perp2()); } |
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54 | |
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55 | inline double FourVector::theta() const { |
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56 | return m_x == 0.0 && m_y == 0.0 && m_z == 0.0 ? 0.0 : std::atan2(perp(),m_z); |
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57 | } |
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58 | |
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59 | inline double FourVector::phi() const { |
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60 | return m_x == 0.0 && m_y == 0.0 ? 0.0 : std::atan2(m_y,m_x); |
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61 | } |
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62 | |
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63 | inline double FourVector::rho() const { |
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64 | return std::sqrt( m_x*m_x + m_y*m_y + m_z*m_z ); |
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65 | } |
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66 | |
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67 | inline bool FourVector::operator == (const FourVector & v) const { |
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68 | return (v.x()==x() && v.y()==y() && v.z()==z() && v.t()==t()) ? true : false; |
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69 | } |
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70 | |
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71 | inline bool FourVector::operator != (const FourVector & v) const { |
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72 | return (v.x()!=x() || v.y()!=y() || v.z()!=z() || v.t()!=t()) ? true : false; |
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73 | } |
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74 | |
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75 | inline double FourVector::pseudoRapidity() const { |
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76 | double m1 = std::sqrt( m_x*m_x + m_y*m_y + m_z*m_z ); |
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77 | if ( m1== 0 ) return 0.0; |
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78 | if ( m1== z() ) return 1.0E72; |
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79 | if ( m1== -z() ) return -1.0E72; |
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80 | return 0.5*log( (m1+z())/(m1-z()) ); |
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81 | } |
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82 | |
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83 | inline double FourVector::eta() const { return pseudoRapidity();} |
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84 | |
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85 | |
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86 | ////////////////////////////////////////////////////////////////////////// |
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87 | // ThreeVector inline methods |
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88 | ////////////////////////////////////////////////////////////////////////// |
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89 | |
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90 | inline void ThreeVector::swap( ThreeVector & other ) { |
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91 | std::swap( m_x, other.m_x ); |
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92 | std::swap( m_y, other.m_y ); |
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93 | std::swap( m_z, other.m_z ); |
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94 | } |
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95 | |
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96 | inline double ThreeVector::theta() const { |
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97 | return m_x == 0.0 && m_y == 0.0 && m_z == 0.0 ? 0.0 : std::atan2(perp(),m_z); |
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98 | } |
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99 | |
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100 | inline double ThreeVector::phi() const { |
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101 | return m_x == 0.0 && m_y == 0.0 ? 0.0 : std::atan2(m_y,m_x); |
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102 | } |
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103 | |
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104 | inline double ThreeVector::r() const { |
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105 | return std::sqrt( m_x*m_x + m_y*m_y + m_z*m_z ); |
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106 | } |
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107 | |
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108 | inline void ThreeVector::set(double xin, double yin, double zin) { |
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109 | m_x = xin; |
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110 | m_y = yin; |
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111 | m_z = zin; |
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112 | } |
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113 | |
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114 | inline void ThreeVector::setPhi(double ph) { |
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115 | double xy = perp(); |
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116 | setX(xy*std::cos(ph)); |
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117 | setY(xy*std::sin(ph)); |
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118 | } |
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119 | |
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120 | inline void ThreeVector::setTheta(double th) { |
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121 | double ma = r(); |
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122 | double ph = phi(); |
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123 | setX(ma*std::sin(th)*std::cos(ph)); |
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124 | setY(ma*std::sin(th)*std::sin(ph)); |
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125 | setZ(ma*std::cos(th)); |
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126 | } |
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127 | |
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128 | inline double ThreeVector::perp2() const { return m_x*m_x + m_y*m_y; } |
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129 | |
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130 | inline double ThreeVector::perp() const { return std::sqrt(perp2()); } |
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131 | |
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132 | inline ThreeVector & ThreeVector::operator = (const ThreeVector & p) { |
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133 | m_x = p.x(); |
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134 | m_y = p.y(); |
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135 | m_z = p.z(); |
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136 | return *this; |
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137 | } |
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138 | |
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139 | |
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140 | inline bool ThreeVector::operator == (const ThreeVector& v) const { |
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141 | return (v.x()==x() && v.y()==y() && v.z()==z()) ? true : false; |
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142 | } |
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143 | |
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144 | inline bool ThreeVector::operator != (const ThreeVector& v) const { |
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145 | return (v.x()!=x() || v.y()!=y() || v.z()!=z()) ? true : false; |
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146 | } |
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147 | |
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148 | } // HepMC |
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