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Geant4/externals/clhep/src/RandExpZiggurat.cc

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Diff markup

Differences between /externals/clhep/src/RandExpZiggurat.cc (Version 11.3.0) and /externals/clhep/src/RandExpZiggurat.cc (Version 11.2.2)


  1 #include "CLHEP/Random/DoubConv.h"                  1 #include "CLHEP/Random/DoubConv.h"
  2                                                     2 
  3 #include "CLHEP/Random/RandExpZiggurat.h"           3 #include "CLHEP/Random/RandExpZiggurat.h"
  4                                                     4 
  5 #include <cmath>  // for std::log()                 5 #include <cmath>  // for std::log()
  6 #include <iostream>                                 6 #include <iostream>
  7 #include <vector>                                   7 #include <vector>
  8                                                     8 
  9 namespace CLHEP {                                   9 namespace CLHEP {
 10                                                    10 
 11 CLHEP_THREAD_LOCAL unsigned long RandExpZiggur     11 CLHEP_THREAD_LOCAL unsigned long RandExpZiggurat::kn[128], RandExpZiggurat::ke[256];
 12 CLHEP_THREAD_LOCAL float RandExpZiggurat::wn[1     12 CLHEP_THREAD_LOCAL float RandExpZiggurat::wn[128],RandExpZiggurat::fn[128],RandExpZiggurat::we[256],RandExpZiggurat::fe[256];
 13 CLHEP_THREAD_LOCAL bool RandExpZiggurat::ziggu     13 CLHEP_THREAD_LOCAL bool RandExpZiggurat::ziggurat_is_init = false;
 14                                                    14 
 15 std::string RandExpZiggurat::name() const {ret     15 std::string RandExpZiggurat::name() const {return "RandExpZiggurat";}
 16                                                    16 
 17 HepRandomEngine & RandExpZiggurat::engine() {r     17 HepRandomEngine & RandExpZiggurat::engine() {return *localEngine;}
 18                                                    18 
 19 RandExpZiggurat::~RandExpZiggurat() {              19 RandExpZiggurat::~RandExpZiggurat() {
 20 }                                                  20 }
 21                                                    21 
 22 RandExpZiggurat::RandExpZiggurat(const RandExp     22 RandExpZiggurat::RandExpZiggurat(const RandExpZiggurat& right) : HepRandom(right),defaultMean(right.defaultMean)
 23 {                                                  23 {
 24 }                                                  24 }
 25                                                    25 
 26 double RandExpZiggurat::operator()()               26 double RandExpZiggurat::operator()()
 27 {                                                  27 {
 28   return fire( defaultMean );                      28   return fire( defaultMean );
 29 }                                                  29 }
 30                                                    30 
 31 void RandExpZiggurat::shootArray( const int si     31 void RandExpZiggurat::shootArray( const int size, float* vect, float mean )
 32 {                                                  32 {
 33    for (int i=0; i<size; ++i) vect[i] = shoot(     33    for (int i=0; i<size; ++i) vect[i] = shoot(mean);
 34 }                                                  34 }
 35                                                    35 
 36 void RandExpZiggurat::shootArray( const int si     36 void RandExpZiggurat::shootArray( const int size, double* vect, double mean )
 37 {                                                  37 {
 38    for (int i=0; i<size; ++i) vect[i] = shoot(     38    for (int i=0; i<size; ++i) vect[i] = shoot(mean);
 39 }                                                  39 }
 40                                                    40 
 41 void RandExpZiggurat::shootArray(HepRandomEngi     41 void RandExpZiggurat::shootArray(HepRandomEngine* anEngine, const int size, float* vect, float mean )
 42 {                                                  42 {
 43    for (int i=0; i<size; ++i) vect[i] = shoot(     43    for (int i=0; i<size; ++i) vect[i] = shoot(anEngine, mean);
 44 }                                                  44 }
 45                                                    45 
 46 void RandExpZiggurat::shootArray(HepRandomEngi     46 void RandExpZiggurat::shootArray(HepRandomEngine* anEngine, const int size, double* vect, double mean )
 47 {                                                  47 {
 48    for (int i=0; i<size; ++i) vect[i] = shoot(     48    for (int i=0; i<size; ++i) vect[i] = shoot(anEngine, mean);
 49 }                                                  49 }
 50                                                    50 
 51 void RandExpZiggurat::fireArray( const int siz     51 void RandExpZiggurat::fireArray( const int size, float* vect)
 52 {                                                  52 {
 53    for (int i=0; i<size; ++i) vect[i] = fire(      53    for (int i=0; i<size; ++i) vect[i] = fire( defaultMean );
 54 }                                                  54 }
 55                                                    55 
 56 void RandExpZiggurat::fireArray( const int siz     56 void RandExpZiggurat::fireArray( const int size, double* vect)
 57 {                                                  57 {
 58    for (int i=0; i<size; ++i) vect[i] = fire(      58    for (int i=0; i<size; ++i) vect[i] = fire( defaultMean );
 59 }                                                  59 }
 60                                                    60 
 61 void RandExpZiggurat::fireArray( const int siz     61 void RandExpZiggurat::fireArray( const int size, float* vect, float mean )
 62 {                                                  62 {
 63    for (int i=0; i<size; ++i) vect[i] = fire(      63    for (int i=0; i<size; ++i) vect[i] = fire( mean );
 64 }                                                  64 }
 65                                                    65 
 66 void RandExpZiggurat::fireArray( const int siz     66 void RandExpZiggurat::fireArray( const int size, double* vect, double mean )
 67 {                                                  67 {
 68    for (int i=0; i<size; ++i) vect[i] = fire(      68    for (int i=0; i<size; ++i) vect[i] = fire( mean );
 69 }                                                  69 }
 70                                                    70 
 71 std::ostream & RandExpZiggurat::put ( std::ost     71 std::ostream & RandExpZiggurat::put ( std::ostream & os ) const {
 72   int pr=os.precision(20);                         72   int pr=os.precision(20);
 73   std::vector<unsigned long> t(2);                 73   std::vector<unsigned long> t(2);
 74   os << " " << name() << "\n";                     74   os << " " << name() << "\n";
 75   os << "Uvec" << "\n";                            75   os << "Uvec" << "\n";
 76   t = DoubConv::dto2longs(defaultMean);            76   t = DoubConv::dto2longs(defaultMean);
 77   os << defaultMean << " " << t[0] << " " << t     77   os << defaultMean << " " << t[0] << " " << t[1] << "\n";
 78   os.precision(pr);                                78   os.precision(pr);
 79   return os;                                       79   return os;
 80 #ifdef REMOVED                                     80 #ifdef REMOVED
 81   int pr=os.precision(20);                         81   int pr=os.precision(20);
 82   os << " " << name() << "\n";                     82   os << " " << name() << "\n";
 83   os << defaultMean << "\n";                       83   os << defaultMean << "\n";
 84   os.precision(pr);                                84   os.precision(pr);
 85   return os;                                       85   return os;
 86 #endif                                             86 #endif
 87 }                                                  87 }
 88                                                    88 
 89 std::istream & RandExpZiggurat::get ( std::ist     89 std::istream & RandExpZiggurat::get ( std::istream & is ) {
 90   std::string inName;                              90   std::string inName;
 91   is >> inName;                                    91   is >> inName;
 92   if (inName != name()) {                          92   if (inName != name()) {
 93     is.clear(std::ios::badbit | is.rdstate());     93     is.clear(std::ios::badbit | is.rdstate());
 94     std::cerr << "Mismatch when expecting to r     94     std::cerr << "Mismatch when expecting to read state of a "
 95             << name() << " distribution\n"         95             << name() << " distribution\n"
 96         << "Name found was " << inName             96         << "Name found was " << inName
 97         << "\nistream is left in the badbit st     97         << "\nistream is left in the badbit state\n";
 98     return is;                                     98     return is;
 99   }                                                99   }
100   if (possibleKeywordInput(is, "Uvec", default    100   if (possibleKeywordInput(is, "Uvec", defaultMean)) {
101     std::vector<unsigned long> t(2);              101     std::vector<unsigned long> t(2);
102     is >> defaultMean >> t[0] >> t[1]; default    102     is >> defaultMean >> t[0] >> t[1]; defaultMean = DoubConv::longs2double(t); 
103     return is;                                    103     return is;
104   }                                               104   }
105   // is >> defaultMean encompassed by possible    105   // is >> defaultMean encompassed by possibleKeywordInput
106   return is;                                      106   return is;
107 }                                                 107 }
108                                                   108 
109                                                   109 
110 float RandExpZiggurat::ziggurat_efix(unsigned     110 float RandExpZiggurat::ziggurat_efix(unsigned long jz,HepRandomEngine* anEngine)
111 {                                                 111 { 
112   if(!ziggurat_is_init) ziggurat_init();          112   if(!ziggurat_is_init) ziggurat_init();
113                                                   113 
114   unsigned long iz=jz&255;                        114   unsigned long iz=jz&255;
115                                                   115   
116   float x;                                        116   float x;
117   for(;;)                                         117   for(;;)
118   {                                               118   {  
119     if(iz==0) return (7.69711-std::log(ziggura    119     if(iz==0) return (7.69711-std::log(ziggurat_UNI(anEngine)));          /* iz==0 */
120     x=jz*we[iz];                                  120     x=jz*we[iz]; 
121     if( fe[iz]+ziggurat_UNI(anEngine)*(fe[iz-1    121     if( fe[iz]+ziggurat_UNI(anEngine)*(fe[iz-1]-fe[iz]) < std::exp(-x) ) return (x);
122                                                   122 
123     /* initiate, try to exit for(;;) loop */      123     /* initiate, try to exit for(;;) loop */
124     jz=ziggurat_SHR3(anEngine);                   124     jz=ziggurat_SHR3(anEngine);
125     iz=(jz&255);                                  125     iz=(jz&255);
126     if(jz<ke[iz]) return (jz*we[iz]);             126     if(jz<ke[iz]) return (jz*we[iz]);
127   }                                               127   }
128 }                                                 128 }
129                                                   129 
130 bool RandExpZiggurat::ziggurat_init()             130 bool RandExpZiggurat::ziggurat_init()
131 {                                                 131 {  
132   const double rzm1 = 2147483648.0, rzm2 = 429    132   const double rzm1 = 2147483648.0, rzm2 = 4294967296.;
133   double dn=3.442619855899,tn=dn,vn=9.91256303    133   double dn=3.442619855899,tn=dn,vn=9.91256303526217e-3, q;
134   double de=7.697117470131487, te=de, ve=3.949    134   double de=7.697117470131487, te=de, ve=3.949659822581572e-3;
135   int i;                                          135   int i;
136                                                   136 
137 /* Set up tables for RNOR */                      137 /* Set up tables for RNOR */
138   q=vn/std::exp(-.5*dn*dn);                       138   q=vn/std::exp(-.5*dn*dn);
139   kn[0]=(unsigned long)((dn/q)*rzm1);             139   kn[0]=(unsigned long)((dn/q)*rzm1);
140   kn[1]=0;                                        140   kn[1]=0;
141                                                   141 
142   wn[0]=q/rzm1;                                   142   wn[0]=q/rzm1;
143   wn[127]=dn/rzm1;                                143   wn[127]=dn/rzm1;
144                                                   144 
145   fn[0]=1.;                                       145   fn[0]=1.;
146   fn[127]=std::exp(-.5*dn*dn);                    146   fn[127]=std::exp(-.5*dn*dn);
147                                                   147 
148   for(i=126;i>=1;i--) {                           148   for(i=126;i>=1;i--) {
149     dn=std::sqrt(-2.*std::log(vn/dn+std::exp(-    149     dn=std::sqrt(-2.*std::log(vn/dn+std::exp(-.5*dn*dn)));
150     kn[i+1]=(unsigned long)((dn/tn)*rzm1);        150     kn[i+1]=(unsigned long)((dn/tn)*rzm1);
151     tn=dn;                                        151     tn=dn;
152     fn[i]=std::exp(-.5*dn*dn);                    152     fn[i]=std::exp(-.5*dn*dn);
153     wn[i]=dn/rzm1;                                153     wn[i]=dn/rzm1;
154   }                                               154   }
155                                                   155 
156 /* Set up tables for REXP */                      156 /* Set up tables for REXP */
157   q = ve/std::exp(-de);                           157   q = ve/std::exp(-de);
158   ke[0]=(unsigned long)((de/q)*rzm2);             158   ke[0]=(unsigned long)((de/q)*rzm2);
159   ke[1]=0;                                        159   ke[1]=0;
160                                                   160 
161   we[0]=q/rzm2;                                   161   we[0]=q/rzm2;
162   we[255]=de/rzm2;                                162   we[255]=de/rzm2;
163                                                   163 
164   fe[0]=1.;                                       164   fe[0]=1.;
165   fe[255]=std::exp(-de);                          165   fe[255]=std::exp(-de);
166                                                   166 
167   for(i=254;i>=1;i--) {                           167   for(i=254;i>=1;i--) {
168     de=-std::log(ve/de+std::exp(-de));            168     de=-std::log(ve/de+std::exp(-de));
169     ke[i+1]= (unsigned long)((de/te)*rzm2);       169     ke[i+1]= (unsigned long)((de/te)*rzm2);
170     te=de;                                        170     te=de;
171     fe[i]=std::exp(-de);                          171     fe[i]=std::exp(-de);
172     we[i]=de/rzm2;                                172     we[i]=de/rzm2;
173   }                                               173   }
174   ziggurat_is_init=true;                          174   ziggurat_is_init=true;
175   return true;                                    175   return true;
176 }                                                 176 }
177                                                   177 
178 }  // namespace CLHEP                             178 }  // namespace CLHEP
179                                                   179