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log_falling_factorial.hpp
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1 #ifndef STAN_MATH_PRIM_SCAL_FUN_LOG_FALLING_FACTORIAL_HPP
2 #define STAN_MATH_PRIM_SCAL_FUN_LOG_FALLING_FACTORIAL_HPP
3 
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_falling_factorial(const T1 x, const T2 n) {
42  return lgamma(x + 1) - lgamma(n + 1);
43  }
44 
45  }
46 }
47 
48 #endif
fvar< T > log_falling_factorial(const fvar< T > &x, const fvar< T > &n)
fvar< T > lgamma(const fvar< T > &x)
Definition: lgamma.hpp:15

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