Stan Math Library  2.12.0
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 
21  template <class RNG>
22  inline double
23  chi_square_rng(const double nu,
24  RNG& rng) {
25  using boost::variate_generator;
26  using boost::random::chi_squared_distribution;
27 
28  static const char* function("chi_square_rng");
29 
30  check_positive_finite(function, "Degrees of freedom parameter", nu);
31 
32  variate_generator<RNG&, chi_squared_distribution<> >
33  chi_square_rng(rng, chi_squared_distribution<>(nu));
34  return chi_square_rng();
35  }
36 
37  }
38 }
39 #endif
double chi_square_rng(const double nu, RNG &rng)
bool check_positive_finite(const char *function, const char *name, const T_y &y)
Return true if y is positive and finite.

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