Stan Math Library  2.15.0
reverse mode automatic differentiation
chi_square_rng.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_PROB_CHI_SQUARE_RNG_HPP
2 #define STAN_MATH_PRIM_SCAL_PROB_CHI_SQUARE_RNG_HPP
3 
4 #include <boost/random/chi_squared_distribution.hpp>
5 #include <boost/random/variate_generator.hpp>
17 
18 namespace stan {
19  namespace math {
20 
31  template <class RNG>
32  inline double
33  chi_square_rng(double nu,
34  RNG& rng) {
35  using boost::variate_generator;
36  using boost::random::chi_squared_distribution;
37 
38  static const char* function("chi_square_rng");
39 
40  check_positive_finite(function, "Degrees of freedom parameter", nu);
41 
42  variate_generator<RNG&, chi_squared_distribution<> >
43  chi_square_rng(rng, chi_squared_distribution<>(nu));
44  return chi_square_rng();
45  }
46 
47  }
48 }
49 #endif
void check_positive_finite(const char *function, const char *name, const T_y &y)
Check if y is positive and finite.
double chi_square_rng(double nu, RNG &rng)
Return a pseudorandom chi squared variate with the nu degrees of freedom using the specified random n...

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