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

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