ROOT::Math::GSLRandomEngine

unsigned int	fCurTime	current time used to seed the generator
ROOT::Math::GSLRng*	fRng	pointer to GSL generator wrapper

 no op , fRng is delete in terminate to avoid problem when copying the instances

void Initialize()

void Terminate()

double operator()()

 generate random between 0 and 1.
 0 is excluded

void RandomArray(double* begin, double* end)

 generate array of randoms betweeen 0 and 1. 0 is excluded
 specialization for double * (to be faster)

void SetSeed(unsigned int seed)

 set the seed, if = 0then the seed is set randomly using an std::rand()
 seeded with the current time. Be carefuk in case the current time is
 the same in consecutive calls

std::string Name()

unsigned int Size()

double GaussianZig(double sigma)

 Gaussian distribution. Use fast ziggurat algorithm implemented since GSL 1.8

double Gaussian(double sigma)

 Gaussian distribution. Use default Box-Muller method

double GaussianRatio(double sigma)

 Gaussian distribution. Use ratio method

double GaussianTail(double a, double sigma)

 Gaussian Tail distribution: eeturn values larger than a distributed
 according to the gaussian

void Gaussian2D(double sigmaX, double sigmaY, double rho, double& x, double& y)

 Gaussian Bivariate distribution, with correlation coefficient rho

double Exponential(double mu)

 Exponential distribution

double Cauchy(double a)

 Cauchy distribution

double Landau()

 Landau distribution

double Gamma(double a, double b)

 Gamma distribution

double LogNormal(double zeta, double sigma)

 Log normal distribution

double ChiSquare(double nu)

 Chi square distribution

double FDist(double nu1, double nu2)

 F distribution

double tDist(double nu)

 t distribution

void Dir2D(double& x, double& y)

 generate random numbers in a 2D circle of radious 1

void Dir3D(double& x, double& y, double& z)

 generate random numbers in a 3D sphere of radious 1

unsigned int Poisson(double mu)

 Poisson distribution

unsigned int Binomial(double p, unsigned int n)

 Binomial distribution

std::vector<unsigned int> Multinomial(unsigned int ntot, const vector<double>& p)

 Multinomial distribution  return vector of integers which sum is ntot

GSLRandomEngine()

GSLRandomEngine( GSLRng * rng)

{}

class ROOT::Math::GSLRandomEngine

Function Members (Methods)

Data Members

Class Charts

Function documentation

virtual	~GSLRandomEngine()
unsigned int	Binomial(double p, unsigned int n)
double	Cauchy(double a)
double	ChiSquare(double nu)
void	Dir2D(double& x, double& y)
void	Dir3D(double& x, double& y, double& z)
double	Exponential(double mu)
double	FDist(double nu1, double nu2)
double	Gamma(double a, double b)
double	Gaussian(double sigma)
void	Gaussian2D(double sigmaX, double sigmaY, double rho, double& x, double& y)
double	GaussianRatio(double sigma)
double	GaussianTail(double a, double sigma)
double	GaussianZig(double sigma)
ROOT::Math::GSLRandomEngine	GSLRandomEngine()
ROOT::Math::GSLRandomEngine	GSLRandomEngine(ROOT::Math::GSLRng* rng)
ROOT::Math::GSLRandomEngine	GSLRandomEngine(const ROOT::Math::GSLRandomEngine&)
void	Initialize()
double	Landau()
double	LogNormal(double zeta, double sigma)
vector<unsigned int>	Multinomial(unsigned int ntot, const vector<double>& p)
string	Name() const
double	operator()()
ROOT::Math::GSLRandomEngine&	operator=(const ROOT::Math::GSLRandomEngine&)
unsigned int	Poisson(double mu)
void	RandomArray(double* begin, double* end)
void	SetSeed(unsigned int seed)
unsigned int	Size() const
double	tDist(double nu)
void	Terminate()