Stan Math Library  2.12.0
reverse mode automatic differentiation
lgamma.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_LGAMMA_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_LGAMMA_HPP
3 
4 #include <stan/math/fwd/core.hpp>
5 
6 #include <boost/math/special_functions/digamma.hpp>
7 
8 namespace stan {
9  namespace math {
10 
11  template <typename T>
12  inline
13  fvar<T>
14  lgamma(const fvar<T>& x) {
16  using boost::math::lgamma;
17  return fvar<T>(lgamma(x.val_), x.d_ * digamma(x.val_));
18  }
19  }
20 }
21 #endif
fvar< T > lgamma(const fvar< T > &x)
Definition: lgamma.hpp:14
var lgamma(const var &a)
The log gamma function for variables (C99).
Definition: lgamma.hpp:35
fvar< T > digamma(const fvar< T > &x)
Definition: digamma.hpp:15

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