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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 namespace math {
10
11 template <typename T>
12 inline
13 fvar<T>
14 lgamma(const fvar<T>& x) {
15 using boost::math::digamma;
16 using boost::math::lgamma;
17 return fvar<T>(lgamma(x.val_), x.d_ * digamma(x.val_));
18 }
19 }
20 }
21 #endif
core.hpp
stan::math::fvar::d_
T d_
Definition: fvar.hpp:14
stan::math::lgamma
fvar< T > lgamma(const fvar< T > &x)
Definition: lgamma.hpp:14
stan
Definition: log_sum_exp.hpp:8
stan::math::fvar::val_
T val_
Definition: fvar.hpp:13
stan::math::lgamma
var lgamma(const var &a)
The log gamma function for variables (C99).
Definition: lgamma.hpp:35
stan::math::fvar
Definition: fvar.hpp:12
stan::math::digamma
fvar< T > digamma(const fvar< T > &x)
Definition: digamma.hpp:15

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