UniformDiscreteDistribution.h

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//
// File: UniformDiscreteDistribution.h
// Authors:
//   Laurent Guéguen
// Created: 2010-04-07 00:00:00
//
 
/*
  Copyright or © or Copr. CNRS, (2010)
  
  This software is a computer program whose purpose is to provide classes
  for numerical calculus.
  
  This software is governed by the CeCILL license under French law and
  abiding by the rules of distribution of free software. You can use,
  modify and/ or redistribute the software under the terms of the CeCILL
  license as circulated by CEA, CNRS and INRIA at the following URL
  "http://www.cecill.info".
  
  As a counterpart to the access to the source code and rights to copy,
  modify and redistribute granted by the license, users are provided only
  with a limited warranty and the software's author, the holder of the
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*/
 
#ifndef BPP_NUMERIC_PROB_UNIFORMDISCRETEDISTRIBUTION_H
#define BPP_NUMERIC_PROB_UNIFORMDISCRETEDISTRIBUTION_H
 
 
#include "../Constraints.h"
#include "../Random/RandomTools.h"
#include "AbstractDiscreteDistribution.h"
 
namespace bpp
{
class UniformDiscreteDistribution :
  public AbstractDiscreteDistribution
{
private:
  double min_;
  double max_;
 
public:
  UniformDiscreteDistribution(unsigned int n, double min = 0., double max = 1.);
 
  UniformDiscreteDistribution(const UniformDiscreteDistribution&);
 
  UniformDiscreteDistribution& operator=(const UniformDiscreteDistribution&);
 
  virtual ~UniformDiscreteDistribution();
 
  UniformDiscreteDistribution* clone() const { return new UniformDiscreteDistribution(*this); }
 
public:
  std::string getName() const {return "Uniform";}
 
  void fireParameterChanged(const ParameterList& parameters);
 
  double randC() const
  {
    double x = RandomTools::giveRandomNumberBetweenZeroAndEntry(max_ - min_) + min_;
    while (!intMinMax_->isCorrect(x))
      x = RandomTools::giveRandomNumberBetweenZeroAndEntry(max_ - min_) + min_;
    return x;
  }
 
  double qProb(double x) const
  {
    return min_ + x * (max_ - min_);
  }
 
  double pProb(double x) const
  {
    return (x <= min_) ? 0 : (x - min_) / (max_ - min_);
  }
 
  double Expectation(double a) const
  {
    return (a <= min_) ? 0 : ((a >= max_) ? (max_ + min_) / 2 : (a * a - min_ * min_) / (max_ - min_) / 2);
  }
};
} // end of namespace bpp.
#endif // BPP_NUMERIC_PROB_UNIFORMDISCRETEDISTRIBUTION_H