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

public member function

<random>

explicit chi_squared_distribution ( result_type n = 1.0 );

explicit chi_squared_distribution ( const param_type& parm );

Construct Chi-squared distribution

n

Number of degrees of freedom, which specifies the number of independent variables simulated by the distribution.
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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// chi_squared_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::chi_squared_distribution<double> distribution (4.0);

  std::cout << "some chi-square-distributed(4.0) results:" << std::endl;
  for (int i=0; i<5; ++i)
    std::cout << distribution(generator) << std::endl;

  return 0;
}

some chi-squared-distributed(4.0) results:
5.69521
7.84941
3.86524
5.4442
5.38723

chi_squared_distribution::reset

Reset distribution (public member function)

chi_squared_distribution::param

Distribution parameters (public member function)

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