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 #ifndef STAN__AGRAD__FWD__FUNCTIONS__LOG1P_EXP_HPP

 #define STAN__AGRAD__FWD__FUNCTIONS__LOG1P_EXP_HPP


 #include <stan/agrad/fwd/fvar.hpp>

 #include <stan/meta/traits.hpp>

 #include <stan/math/functions/log1p_exp.hpp>


 namespace stan {


   namespace agrad {


     template <typename T>

     inline

     fvar<T>

     log1p_exp(const fvar<T>& x) {

       using stan::math::log1p_exp;

       using std::exp;

       return fvar<T>(log1p_exp(x.val_), x.d_ / (1 + exp(-x.val_)));

     }

   }

 }

 #endif

stan::agrad::log1p_exp
fvar< T > log1p_exp(const fvar< T > &x)
Definition: log1p_exp.hpp:15

stan::math::log1p_exp
boost::math::tools::promote_args< T >::type log1p_exp(const T a)
Calculates the log of 1 plus the exponential of the specified value without overflow.
Definition: log1p_exp.hpp:44

log1p_exp.hpp

stan::agrad::fvar
Definition: fvar.hpp:13

traits.hpp

fvar.hpp

stan::agrad::fvar::d_
T d_
Definition: fvar.hpp:16

stan::agrad::exp
fvar< T > exp(const fvar< T > &x)
Definition: exp.hpp:16

stan::agrad::fvar::val_
T val_
Definition: fvar.hpp:15