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Showing content from https://cplusplus.com/reference/random/fisher_f_distribution/fisher_f_distribution/ below:

public member function

<random>

explicit fisher_f_distribution ( result_type m = 1.0, result_type n = 1.0 );

explicit fisher_f_distribution ( const param_type& parm );

Construct Fisher F-distribution

m

Distribution parameter m, which specifies the numerator's degrees of freedomn.
This shall be a positive value (m>0).
result_type is a member type that represents the type of the random numbers generated on each call to operator(). It is defined as an alias of the first class template parameter (RealType).

n

Distribution parameter n, which specifies the denominator's degrees of freedom.
This shall be a positive value (n>0).
result_type is a member type that represents the type of the random numbers generated on each call to operator(). It is defined as an alias of the first class template parameter (RealType).

parm

An object representing the distribution's parameters, obtained by a call to member function param.
param_type is a member type.

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// fisher_f_distribution example
#include <iostream>
#include <chrono>
#include <random>

int main()
{
  // construct a trivial random generator engine from a time-based seed:
  unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
  std::default_random_engine generator (seed);

  std::fisher_f_distribution<double> distribution (2.0,2.0);

  std::cout << "some F-distributed(2.0,2.0) results:" << std::endl;
  for (int i=0; i<5; ++i)
    std::cout << distribution(generator) << std::endl;

  return 0;
}

some F-distributed(2.0,2.0) results:
0.226118
0.208781
0.0283665
2.15256
0.37961

fisher_f_distribution::reset

Reset distribution (public member function)

fisher_f_distribution::param

Distribution parameters (public member function)

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