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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 
4 #include <boost/random/exponential_distribution.hpp>
5 #include <boost/random/variate_generator.hpp>
20 
21 namespace stan {
22 
23  namespace math {
24 
25  template <class RNG>
26  inline double
27  exponential_rng(const double beta,
28  RNG& rng) {
29  using boost::variate_generator;
30  using boost::exponential_distribution;
31 
32  static const char* function("stan::math::exponential_rng");
33 
35 
36  check_positive_finite(function, "Inverse scale parameter", beta);
37 
38  variate_generator<RNG&, exponential_distribution<> >
39  exp_rng(rng, exponential_distribution<>(beta));
40  return exp_rng();
41  }
42  }
43 }
44 
45 #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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