1 #ifndef STAN_MATH_FWD_SCAL_FUN_TRIGAMMA_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_TRIGAMMA_HPP
3 
4 #include <stan/math/fwd/core.hpp>
5 #include <stan/math/fwd/scal/fun/floor.hpp>
6 #include <stan/math/fwd/scal/fun/sin.hpp>
7 #include <stan/math/prim/scal/fun/trigamma.hpp>
8 
9 namespace stan {
10 namespace math {
11 
12 /**
13  * Return the value of the trigamma function at the specified
14  * argument (i.e., the second derivative of the log Gamma function
15  * at the specified argument).
16  *
17  * @param u argument
18  * @return trigamma function at argument
19  */
20 template <typename T>
trigamma(const fvar<T> & u)21 inline fvar<T> trigamma(const fvar<T>& u) {
22   return trigamma_impl(u);
23 }
24 
25 }  // namespace math
26 }  // namespace stan
27 #endif
28