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log_rising_factorial.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_FUN_LOG_RISING_FACTORIAL_HPP
2 #define STAN_MATH_PRIM_SCAL_FUN_LOG_RISING_FACTORIAL_HPP
3 
4 #include <boost/math/special_functions/gamma.hpp>
5 
6 namespace stan {
7  namespace math {
8 
39  template<typename T1, typename T2>
40  inline typename boost::math::tools::promote_args<T1, T2>::type
41  log_rising_factorial(const T1 x, const T2 n) {
42  using boost::math::lgamma;
43  return lgamma(x + n) - lgamma(x);
44  }
45 
46  }
47 }
48 
49 #endif
fvar< T > lgamma(const fvar< T > &x)
Definition: lgamma.hpp:15
fvar< T > log_rising_factorial(const fvar< T > &x, const fvar< T > &n)

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