29 Numerics library [numerics]

A fisher_­f_­distribution random number distribution produces random numbers x≥0 distributed according to the probability density function

$$p(x|m,n)=\frac{\Gamma ((m+n)/2)}{\Gamma \left(m/2\right)\Gamma \left(n/2\right)}\cdot {\left(\frac{m}{n}\right)}^{m/2}\cdot x^{\left(m/2\right)-1}\cdot {\left(1+\frac{mx}{n}\right)}^{-(m+n)/2}\text{.}$$

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

    // constructor and reset functions
    explicit fisher_f_distribution(RealType m = 1, RealType n = 1);
    explicit fisher_f_distribution(const param_type& parm);
    void reset();

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

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