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25 // 25 //
26 // G4Pow class implemenation << 26 // $Id: G4Pow.cc 93311 2015-10-16 10:16:37Z gcosmo $
27 // 27 //
28 // Author: Vladimir Ivanchenko, 23.05.2009 << 28 // -------------------------------------------------------------------
29 // Revisions: << 29 //
30 // - 23.03.2018, M.Novak: increased accuracy o << 30 // GEANT4 Class file
31 // [1/4,4] interval by << 31 //
32 // ------------------------------------------- << 32 //
>> 33 // File name: G4Pow
>> 34 //
>> 35 // Author: Vladimir Ivanchenko
>> 36 //
>> 37 // Creation date: 23.05.2009
>> 38 //
>> 39 // Modifications:
>> 40 // 08.01.2011 V.Ivanchenko extended maxZ from 256 to 512
>> 41 // 02.05.2013 V.Ivanchenko added expA and logX methods,
>> 42 // revised A13, logA, powZ, powA to improved accuracy
>> 43 //
>> 44 // -------------------------------------------------------------------
33 45
34 #include "G4Pow.hh" 46 #include "G4Pow.hh"
>> 47 #ifdef G4MULTITHREADED
35 #include "G4Threading.hh" 48 #include "G4Threading.hh"
>> 49 #endif
36 50
37 G4Pow* G4Pow::fpInstance = nullptr; << 51 G4Pow* G4Pow::fpInstance = 0;
38 52
39 // ------------------------------------------- 53 // -------------------------------------------------------------------
40 54
41 G4Pow* G4Pow::GetInstance() 55 G4Pow* G4Pow::GetInstance()
42 { 56 {
43 if(fpInstance == nullptr) << 57 if (fpInstance == 0)
44 { 58 {
45 static G4Pow geant4pow; 59 static G4Pow geant4pow;
46 fpInstance = &geant4pow; 60 fpInstance = &geant4pow;
47 } 61 }
48 return fpInstance; 62 return fpInstance;
49 } 63 }
50 64
51 // ------------------------------------------- 65 // -------------------------------------------------------------------
52 66
53 G4Pow::G4Pow() 67 G4Pow::G4Pow()
54 { << 68 : onethird(1.0/3.0), max2(5)
>> 69 {
55 #ifdef G4MULTITHREADED 70 #ifdef G4MULTITHREADED
56 if(G4Threading::IsWorkerThread()) 71 if(G4Threading::IsWorkerThread())
57 { << 72 {
58 G4Exception("G4Pow::G4Pow()", "InvalidSetu << 73 G4Exception ("G4Pow::G4Pow()", "InvalidSetup", FatalException,
59 "Attempt to instantiate G4Pow << 74 "Attempt to instantiate G4Pow in worker thread!");
60 } 75 }
61 #endif 76 #endif
62 const G4int maxZ = 512; << 77 const G4int maxZ = 512;
63 const G4int maxZfact = 170; << 78 const G4int maxZfact = 170;
64 const G4int numLowA = 17; <<
65 79
66 maxA = -0.6 + maxZ; 80 maxA = -0.6 + maxZ;
67 maxLowA = 4.0; << 81 maxA2 = 1.25 + max2*0.2;
68 maxA2 = 1.25 + max2 * 0.2; << 82 maxAexp = -0.76+ maxZfact*0.5;
69 maxAexp = -0.76 + maxZfact * 0.5; << 83
70 << 84 ener.resize(max2+1,1.0);
71 ener.resize(max2 + 1, 1.0); << 85 logen.resize(max2+1,0.0);
72 logen.resize(max2 + 1, 0.0); << 86 lz2.resize(max2+1,0.0);
73 lz2.resize(max2 + 1, 0.0); << 87 pz13.resize(maxZ,0.0);
74 pz13.resize(maxZ, 0.0); << 88 lz.resize(maxZ,0.0);
75 lowa13.resize(numLowA, 0.0); << 89 fexp.resize(maxZfact,0.0);
76 lz.resize(maxZ, 0.0); << 90 fact.resize(maxZfact,0.0);
77 fexp.resize(maxZfact, 0.0); << 91 logfact.resize(maxZ,0.0);
78 fact.resize(maxZfact, 0.0); <<
79 logfact.resize(maxZ, 0.0); <<
80 92
81 G4double f = 1.0; << 93 G4double f = 1.0;
82 G4double logf = 0.0; 94 G4double logf = 0.0;
83 fact[0] = 1.0; << 95 fact[0] = 1.0;
84 fexp[0] = 1.0; << 96 fexp[0] = 1.0;
85 97
86 for(G4int i = 1; i <= max2; ++i) << 98 for(G4int i=1; i<=max2; ++i)
87 { 99 {
88 ener[i] = powN(500., i); << 100 ener[i] = powN(500.,i);
89 logen[i] = G4Log(ener[i]); << 101 logen[i]= G4Log(ener[i]);
90 lz2[i] = G4Log(1.0 + i * 0.2); << 102 lz2[i] = G4Log(1.0 + i*0.2);
91 } 103 }
92 104
93 for(G4int i = 1; i < maxZ; ++i) << 105 for(G4int i=1; i<maxZ; ++i)
94 { 106 {
95 auto x = G4double(i); << 107 G4double x = G4double(i);
96 pz13[i] = std::pow(x, onethird); << 108 pz13[i] = std::pow(x,onethird);
97 lz[i] = G4Log(x); << 109 lz[i] = G4Log(x);
98 if(i < maxZfact) 110 if(i < maxZfact)
99 { << 111 {
100 f *= x; << 112 f *= x;
101 fact[i] = f; 113 fact[i] = f;
102 fexp[i] = G4Exp(0.5 * i); << 114 fexp[i] = G4Exp(0.5*i);
103 } 115 }
104 logf += lz[i]; 116 logf += lz[i];
105 logfact[i] = logf; 117 logfact[i] = logf;
106 } 118 }
107 <<
108 for(G4int i = 4; i < numLowA; ++i) <<
109 { <<
110 lowa13[i] = std::pow(0.25 * i, onethird); <<
111 } <<
112 } 119 }
113 120
114 // ------------------------------------------- 121 // -------------------------------------------------------------------
115 122
116 G4double G4Pow::A13(G4double A) const << 123 G4Pow::~G4Pow()
117 { << 124 {}
118 G4double res = 0.; <<
119 if(A > 0.) <<
120 { <<
121 const bool invert = (A < 1.); <<
122 const G4double a = invert ? 1. / A : A; <<
123 res = (a < maxLowA) ? A13Low <<
124 } <<
125 return res; <<
126 } <<
127 <<
128 // ------------------------------------------- <<
129 <<
130 G4double G4Pow::A13High(const G4double a, cons <<
131 { <<
132 G4double res; <<
133 if(a < maxA) <<
134 { <<
135 const auto i = static_cast<G4int>(a + <<
136 const G4double x = (a / i - 1.) * onethird <<
137 res = pz13[i] * (1. + x - x * <<
138 } <<
139 else <<
140 { <<
141 res = G4Exp(G4Log(a) * onethird); <<
142 } <<
143 res = invert ? 1. / res : res; <<
144 return res; <<
145 } <<
146 <<
147 // ------------------------------------------- <<
148 <<
149 G4double G4Pow::A13Low(const G4double a, const <<
150 { <<
151 G4double res; <<
152 const auto i = static_cast<G4int>(4. * ( <<
153 const G4double y = 0.25 * i; <<
154 const G4double x = (a / y - 1.) * onethird; <<
155 res = lowa13[i] * (1. + x - x * <<
156 res = invert ? 1. / res : res; <<
157 return res; <<
158 } <<
159 125
160 // ------------------------------------------- 126 // -------------------------------------------------------------------
161 127
162 G4double G4Pow::powN(G4double x, G4int n) cons 128 G4double G4Pow::powN(G4double x, G4int n) const
163 { 129 {
164 if(0.0 == x) << 130 if(0.0 == x) { return 0.0; }
165 { << 131 if(std::abs(n) > 8) { return std::pow(x, G4double(n)); }
166 return 0.0; <<
167 } <<
168 if(std::abs(n) > 8) <<
169 { <<
170 return std::pow(x, G4double(n)); <<
171 } <<
172 G4double res = 1.0; 132 G4double res = 1.0;
173 if(n >= 0) << 133 if(n >= 0) { for(G4int i=0; i<n; ++i) { res *= x; } }
174 { <<
175 for(G4int i = 0; i < n; ++i) <<
176 { <<
177 res *= x; <<
178 } <<
179 } <<
180 else if(n < 0) 134 else if(n < 0)
181 { 135 {
182 G4double y = 1.0 / x; << 136 G4double y = 1.0/x;
183 G4int nn = -n; << 137 G4int nn = -n;
184 for(G4int i = 0; i < nn; ++i) << 138 for(G4int i=0; i<nn; ++i) { res *= y; }
185 { <<
186 res *= y; <<
187 } <<
188 } 139 }
189 return res; 140 return res;
190 } 141 }
191 142