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reverse mode automatic differentiation
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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 
10  namespace math {
11 
12  template <typename T>
13  inline
14  fvar<T>
15  lgamma(const fvar<T>& x) {
17  using boost::math::lgamma;
18  return fvar<T>(lgamma(x.val_), x.d_ * digamma(x.val_));
19  }
20  }
21 }
22 #endif
fvar< T > lgamma(const fvar< T > &x)
Definition: lgamma.hpp:15
var lgamma(const stan::math::var &a)
The log gamma function for variables (C99).
Definition: lgamma.hpp:35
fvar< T > digamma(const fvar< T > &x)
Definition: digamma.hpp:16

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