source: pacpusframework/trunk/include/Pacpus/PacpusTools/math/rng.hpp@ 18

#ifndef __BOOST_RNG__
#define __BOOST_RNG__

#include <boost/random.hpp>
#include <boost/math/distributions.hpp>
#include <ctime>

namespace math {

namespace rng {

/*!
 * \class normal_generator
 * \brief This class is basic normal random number generator \n
 * template id RealType describe number precision (float double ....)\n
 * template id PRNG describe pseudo random number generator ( see boost random)
 */
template < class RealType , class PRNG > class normal_generator {
public :
  /*!
   * Default construtor
   */
  normal_generator():
  engine(time(NULL)),
  generator(engine,boost::normal_distribution<RealType>(0,1))
  {}
  /*!
   * Construtor
   * \param dist : a normal distribution (see boost distributions)
   */
  normal_generator(const boost::math::normal_distribution<RealType> & dist):
  engine(time(NULL)),
  generator(engine,boost::normal_distribution<RealType>(dist.mean(),dist.sigma()))
  {}
  /*!
   * Construtor
   * \param mean : mean of the normal distribution 
   * \param sigma : satndard deviation of the normal distribution 
   */
  normal_generator(const RealType & mean ,const RealType & sigma):
  engine(time(NULL)),
  generator(engine,boost::normal_distribution<RealType>(mean(),sigma()))
  {}

  /*!
   * Get a random number
   */
  RealType operator()() {return generator();}

  /*!
   * Set normal distribution
   * \param dist : a normal distribution (see boost distributions)
   */
  void distribution( const boost::math::normal_distribution<RealType> & dist) { 
    generator.dist= boost::normal_distribution<RealType>(dist.mean(),dist.standard_deviation());
  }

  /*!
   * Set normal distrubution
   * \param mean : mean of the normal distribution 
   * \param sigma : satndard deviation of the normal distribution 
   */
  void distribution( const RealType & mean ,const RealType & sigma) { 
    generator.distribution()= boost::normal_distribution<RealType>(mean,sigma);
  }

  private :

  /*!
   * \brief pseudo random number generator
   */
  PRNG engine; 

  /*!
   * \brief the normal random number generator
   */
  boost::variate_generator<PRNG, boost::normal_distribution<RealType> > generator;
};

typedef class normal_generator<double,boost::mt19937> normal_rng;



/*!
 * \class uniform_generator
 * \brief This class is basic uniform random number generator \n
 * template id RealType describe number precision (float double ....)\n
 * template id PRNG describe pseudo random number generator ( see boost random)
 */
template < class RealType , class PRNG > class uniform_generator {

public : 
  /*!
   * Default construtor
   */
  uniform_generator():
  engine(time(NULL)), 
  generator(engine, boost::uniform_real<RealType>(0,1))
  {}
  /*!
   * Construtor
   * \param dist : a uniform distribution (see boost distributions)
   */
   uniform_generator(const boost::math::uniform_distribution<RealType> & dist):
   engine(time(NULL)),
   generator(engine, boost::uniform_real<RealType>(dist.lower(),dist.upper()))
   {}
  /*!
   * Construtor
   * \param lower : the lower value of the uniform distribution 
   * \param upper : the upper value of the uniform distribution 
   */
  uniform_generator(const RealType & lower , const RealType & upper):
  engine(time(NULL)),
  generator(engine, boost::uniform_real<RealType>(lower,upper))
  {}

  /*!
   * Get a random number
   */
  RealType operator()() {return generator();}
  /*!
   * Set uniform distribution
   * \param dist : a normal distribution (see boost distributions)
   */
  void distribution( const boost::math::uniform_distribution<RealType> & dist) { 
    generator.dist()= boost::uniform_real<RealType>(dist.lower(),dist.upper());
  }
  /*!
   * Set uniform distribution
   * \param lower : the lower value of the uniform distribution 
   * \param upper : the upper value of the uniform distribution 
   */
  void distribution( const RealType & lower , const RealType & upper) { 
    generator.dist()= boost::uniform_real<RealType>(lower,upper);
  }

  private :
  /*!
   * \brief pseudo random number generator
   */
  PRNG engine;
  /*!
   * \brief the uniform random number generator
   */
  boost::variate_generator<PRNG, boost::uniform_real<RealType> > generator;
};

typedef class uniform_generator<double,boost::mt19937> uniform_rng;


/*!
 * \class traingle_generator
 * \brief This class is basic triangular random number generator \n
 * template id RealType describe number precision (float double ....)\n
 * template id PRNG describe pseudo random number generator ( see boost random)
 */
template < class RealType , class PRNG > class triangle_generator {

public : 
  /*!
   * Default construtor
   */
  triangle_generator():
  engine(time(NULL)), 
  generator(engine, boost::triangle_distribution<RealType>(-1,0,1))
  {}
  /*!
   * Construtor
   * \param dist : a traingle distribution (see boost distributions)
   */
   triangle_generator(const boost::math::triangular_distribution<RealType> & dist):
   engine(time(NULL)),
   generator(engine, boost::triangle_distribution<RealType>(dist.lower(),dist.upper()))
   {}
  /*!
   * Constructor :
   * \param lower : the lower value of the uniform distribution 
   * \param mode : the mode value of the uniform distribution 
   * \param upper : the upper value of the uniform distribution 
   */
  triangle_generator(const RealType & lower , const RealType & mode ,const RealType & upper):
  engine(time(NULL)),
  generator(engine, boost::triangle_distribution<RealType>(lower,mode,upper))
  {}
  /*!
   * Get a random number
   */
  RealType operator()() {return generator();}
  /*!
   * Set triangle distribution
   * \param dist : a normal distribution (see boost distributions)
   */
  void distribution( const boost::math::triangular_distribution<RealType> & dist) { 
    generator.dist()= boost::triangle_distribution<RealType>(dist.lower(),dist.mode(),dist.upper());
  }
  /*!
   * Set triangle distribution
   * \param lower : the lower value of the uniform distribution 
   * \param mode : the mode value of the uniform distribution 
   * \param upper : the upper value of the uniform distribution 
   */
  void distribution( const RealType & lower ,const RealType & mode ,const RealType & upper) { 
    generator.dist()= boost::triangle_distribution<RealType>(lower,mode,upper);
  }

  private :
  /*!
   * \brief pseudo random number generator
   */
  PRNG engine;
  /*!
   * \brief the triangle random number generator
   */
  boost::variate_generator<PRNG, boost::triangle_distribution<RealType> > generator;
};

typedef class triangle_generator<double,boost::mt19937> triangle_rng;

};
};
#endif