26 Numerics library [numerics]

A gamma_distribution random number distribution produces random numbers x > 0 distributed according to the probability density function p(x | α,β) = e^-x/β β^α · Γ(α)   ·   x  ^α-1 .

template<class RealType = double>
 class gamma_distribution{
public:
 // types
 typedef RealType result_type;
 typedef unspecified param_type;

 // constructors and reset functions
 explicit gamma_distribution(RealType alpha = 1.0, RealType beta = 1.0);
 explicit gamma_distribution(const param_type& parm);
 void reset();

 // generating functions
 template<class URNG>
   result_type operator()(URNG& g);
 template<class URNG>
   result_type operator()(URNG& g, const param_type& parm);

 // property functions
 RealType alpha() const;
 RealType beta() const;
 param_type param() const;
 void param(const param_type& parm);
 result_type min() const;
 result_type max() const;
};

explicit gamma_distribution(RealType alpha = 1.0, RealType beta = 1.0);