Stan Math Library  2.12.0
reverse mode automatic differentiation
exponential_rng.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_PROB_EXPONENTIAL_RNG_HPP
2 #define STAN_MATH_PRIM_SCAL_PROB_EXPONENTIAL_RNG_HPP
3 
15 #include <boost/random/exponential_distribution.hpp>
16 #include <boost/random/variate_generator.hpp>
17 
18 namespace stan {
19  namespace math {
20 
21  template <class RNG>
22  inline double
23  exponential_rng(const double beta,
24  RNG& rng) {
25  using boost::variate_generator;
26  using boost::exponential_distribution;
27 
28  static const char* function("exponential_rng");
29 
30  check_positive_finite(function, "Inverse scale parameter", beta);
31 
32  variate_generator<RNG&, exponential_distribution<> >
33  exp_rng(rng, exponential_distribution<>(beta));
34  return exp_rng();
35  }
36 
37  }
38 }
39 #endif
double exponential_rng(const double beta, 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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