Stan Math Library  2.9.0
reverse mode automatic differentiation
student_t_rng.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_PROB_STUDENT_T_RNG_HPP
2 #define STAN_MATH_PRIM_SCAL_PROB_STUDENT_T_RNG_HPP
3 
4 #include <boost/random/student_t_distribution.hpp>
5 #include <boost/random/variate_generator.hpp>
22 
23 namespace stan {
24 
25  namespace math {
26 
27  template <class RNG>
28  inline double
29  student_t_rng(const double nu,
30  const double mu,
31  const double sigma,
32  RNG& rng) {
33  using boost::variate_generator;
34  using boost::random::student_t_distribution;
35 
36  static const char* function("stan::math::student_t_rng");
37 
40 
41  check_positive_finite(function, "Degrees of freedom parameter", nu);
42  check_finite(function, "Location parameter", mu);
43  check_positive_finite(function, "Scale parameter", sigma);
44 
45  variate_generator<RNG&, student_t_distribution<> >
46  rng_unit_student_t(rng, student_t_distribution<>(nu));
47  return mu + sigma * rng_unit_student_t();
48  }
49  }
50 }
51 #endif
double student_t_rng(const double nu, const double mu, const double sigma, RNG &rng)
bool check_finite(const char *function, const char *name, const T_y &y)
Return true if y is finite.
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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