GRan.hpp
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/***************************************************************************
* GRan.hpp - Random number generator class *
* ----------------------------------------------------------------------- *
* copyright (C) 2011-2014 by Juergen Knoedlseder *
* ----------------------------------------------------------------------- *
* *
* This program is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see <http://www.gnu.org/licenses/>. *
* *
***************************************************************************/
/**
* @file GRan.hpp
* @brief Random number generator class definition
* @author Juergen Knoedlseder
*/
#ifndef GRAN_HPP
#define GRAN_HPP
/* __ Includes ___________________________________________________________ */
#include <string>
#include <vector>
#include "GBase.hpp"
#include "GVector.hpp"
/***********************************************************************//**
* @class GRan
*
* @brief Random number generator class
*
* This class implements a random number generator.
***************************************************************************/
class GRan : public GBase {
public:
// Constructors and destructors
GRan(void);
GRan(unsigned long long int seed);
GRan(const GRan& ran);
virtual ~GRan(void);
// Operators
GRan& operator=(const GRan& ran);
// Methods
void clear(void);
GRan* clone(void) const;
std::string classname(void) const;
void seed(unsigned long long int seed);
unsigned long long int seed(void) const;
unsigned long int int32(void);
unsigned long long int int64(void);
double uniform(void);
double normal(void);
double exp(const double& lambda);
double poisson(const double& lambda);
double chisq2(void);
int cdf(const std::vector<double>& cdf);
int cdf(const GVector& cdf);
std::string print(const GChatter& chatter = NORMAL) const;
protected:
// Protected methods
void init_members(unsigned long long int seed = 41L);
void copy_members(const GRan& ran);
void free_members(void);
// Protected data members
unsigned long long int m_seed; //!< Random number generator seed
unsigned long long int m_value1; //!< Value 1
unsigned long long int m_value2; //!< Value 2
unsigned long long int m_value3; //!< Value 3
// Poisson cache
double m_old_lambda; //!< Old lambda value
double m_sqrt_lambda; //!< sqrt(2*lambda)
double m_log_lambda; //!< log(lambda)
double m_exp_lambda; //!< exp(-lambda)
};
/***********************************************************************//**
* @brief Return class name
*
* @return String containing the class name ("GRan").
***************************************************************************/
inline
std::string GRan::classname(void) const
{
return ("GRan");
}
/***********************************************************************//**
* @brief Return seed value
*
* @return Seed value.
***************************************************************************/
inline
unsigned long long int GRan::seed(void) const
{
return m_seed;
}
#endif /* GRAN_HPP */