Stan Math Library  2.10.0
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 
20  namespace math {
21 
22  template <class RNG>
23  inline double
24  chi_square_rng(const double nu,
25  RNG& rng) {
26  using boost::variate_generator;
27  using boost::random::chi_squared_distribution;
28 
29  static const char* function("stan::math::chi_square_rng");
30 
32 
33  check_positive_finite(function, "Degrees of freedom parameter", nu);
34 
35  variate_generator<RNG&, chi_squared_distribution<> >
36  chi_square_rng(rng, chi_squared_distribution<>(nu));
37  return chi_square_rng();
38  }
39  }
40 }
41 #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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