Shark Machine Learning Library
Normal.h
Go to the documentation of this file.00001 //=========================================================================== 00041 //=========================================================================== 00042 00043 00044 #ifndef __NORMAL_H 00045 #define __NORMAL_H 00046 00047 #include <cmath> 00048 #include "Rng/RandomVar.h" 00049 00050 00051 //=========================================================================== 00090 class Normal : public RandomVar< double > 00091 { 00092 public: 00093 00097 Normal(double mean = 0, double variance = 1); 00098 00099 00104 Normal(double mean, double variance, RNG& r); 00105 00106 //======================================================================== 00131 void seed(long s) 00132 { 00133 RandomVar< double >::seed(s); iset = false; 00134 } 00135 00136 00137 //======================================================================== 00154 double mean() const 00155 { 00156 return pMean; 00157 } 00158 00159 00160 //======================================================================== 00184 double variance() const 00185 { 00186 return pStdDev * pStdDev; 00187 } 00188 00189 00190 //======================================================================== 00208 void mean(double newMean) 00209 { 00210 pMean = newMean; 00211 } 00212 00213 //======================================================================== 00236 void variance(double newVar) 00237 { 00238 pStdDev = sqrt(newVar); 00239 } 00240 00243 double operator()(double mean, double variance); 00244 00248 double operator()(); 00249 00253 double p(const double&) const; 00254 00255 protected: 00256 00258 double pMean; 00259 00261 double pStdDev; 00262 00263 private: 00264 00265 // If set to "true", the second normally distributed 00266 // random number, generated one step before, was 00267 // stored in "gset" and can be returned at once. Otherwise, 00268 // two new random numbers must be generated. 00269 bool iset; 00270 00271 // The second generated normally distributed random number 00272 // is stored here, when "iset" is set to "true". 00273 double gset; 00274 00275 }; 00276 00277 #endif /* !__NORMAL_H */ 00278