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log1p_exp.hpp
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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>
6 
7 namespace stan {
8  namespace math {
9 
10  template <typename T>
11  inline
12  fvar<T>
13  log1p_exp(const fvar<T>& x) {
15  using std::exp;
16  return fvar<T>(log1p_exp(x.val_), x.d_ / (1 + exp(-x.val_)));
17  }
18 
19  }
20 }
21 #endif
fvar< T > exp(const fvar< T > &x)
Definition: exp.hpp:10
fvar< T > log1p_exp(const fvar< T > &x)
Definition: log1p_exp.hpp:13

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