1 #ifndef STAN_MATH_FWD_SCAL_FUN_LOG1P_EXP_HPP 2 #define STAN_MATH_FWD_SCAL_FUN_LOG1P_EXP_HPP 3 4 #include <stan/math/fwd/core.hpp> 5 #include <stan/math/prim/scal/fun/log1p_exp.hpp> 6 7 namespace stan { 8 namespace math { 9 10 template <typename T> log1p_exp(const fvar<T> & x)11inline fvar<T> log1p_exp(const fvar<T>& x) { 12 using std::exp; 13 return fvar<T>(log1p_exp(x.val_), x.d_ / (1 + exp(-x.val_))); 14 } 15 16 } // namespace math 17 } // namespace stan 18 #endif 19