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tgamma.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_TGAMMA_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_TGAMMA_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  tgamma(const fvar<T>& x) {
17  using boost::math::tgamma;
18  T u = tgamma(x.val_);
19  return fvar<T>(u, x.d_ * u * digamma(x.val_));
20  }
21  }
22 }
23 #endif
var tgamma(const stan::math::var &a)
Return the Gamma function applied to the specified variable (C99).
Definition: tgamma.hpp:65
fvar< T > tgamma(const fvar< T > &x)
Definition: tgamma.hpp:15
fvar< T > digamma(const fvar< T > &x)
Definition: digamma.hpp:16

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