A
gamma_distribution random number distribution
produces random numbers
x>0
distributed according to
the probability density function
p(x|α,β)=e−x/ββα⋅Γ(α)⋅xα−1 .template<class RealType = double>
class gamma_distribution {
public:
using result_type = RealType;
using param_type = unspecified;
gamma_distribution() : gamma_distribution(1.0) {}
explicit gamma_distribution(RealType alpha, RealType beta = 1.0);
explicit gamma_distribution(const param_type& parm);
void reset();
template<class URBG>
result_type operator()(URBG& g);
template<class URBG>
result_type operator()(URBG& g, const param_type& parm);
RealType alpha() const;
RealType beta() const;
param_type param() const;
void param(const param_type& parm);
result_type min() const;
result_type max() const;
};