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62 lines
2.2 KiB
C++
62 lines
2.2 KiB
C++
// $Id: betaDistribution.h 5803 2009-01-20 09:17:05Z adido $
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#ifndef ___BETA_DIST
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#define ___BETA_DIST
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/************************************************************
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This distribution can take several forms depending on its free parameters alpha,beta
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For an extensive exlpanation of this distribution
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see http://mathworld.wolfram.com/BetaDistribution.html
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************************************************************/
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#include "definitions.h"
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#include "distribution.h"
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class betaDistribution : public distribution {
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public:
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enum discretizationType{MEAN, MEDIAN};
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explicit betaDistribution(MDOUBLE alpha, MDOUBLE beta, int in_number_of_categories,discretizationType in_discretizationType = MEDIAN);
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explicit betaDistribution(const betaDistribution& other);
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explicit betaDistribution();
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virtual ~betaDistribution();
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virtual void setBetaParameters(int numOfCategories ,MDOUBLE alpha, MDOUBLE beta);
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virtual const int categories() const {return _rates.size();}
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virtual const MDOUBLE rates(const int i) const {return _rates[i]*_globalRate;}
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virtual const MDOUBLE ratesProb(const int i) const {return _ratesProb[i];}
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virtual distribution* clone() const { return new betaDistribution(*this); }
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virtual void setGlobalRate(const MDOUBLE x) {_globalRate = x;}
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virtual MDOUBLE getGlobalRate()const {return _globalRate;}
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virtual const MDOUBLE getCumulativeProb(const MDOUBLE x) const;
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virtual void setAlpha(MDOUBLE newAlpha);
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virtual MDOUBLE getAlpha() const {return _alpha;};
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virtual void setBeta(MDOUBLE newBeta);
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virtual MDOUBLE getBeta() const {return _beta;};
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virtual void setDiscretizationType(discretizationType in_discretizationType);
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virtual discretizationType getDiscretizationType() const {return _discretizationType;};
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virtual void change_number_of_categories(int in_number_of_categories);
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virtual MDOUBLE getBorder(const int i) const {return _boundary[i];} //return the ith border. Note: _bonderi[0] = 0, _bondery[categories()] = infinite
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private:
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int fill_rates();
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int fill_boundaries();
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protected:
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MDOUBLE _alpha;
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MDOUBLE _beta;
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vector<MDOUBLE> _rates;
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vector<MDOUBLE> _ratesProb;
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MDOUBLE _globalRate;
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discretizationType _discretizationType;
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vector<MDOUBLE> _boundary;
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};
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#endif
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