Stan Math Library  2.14.0
reverse mode automatic differentiation
acosh.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_ACOSH_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_ACOSH_HPP
3 
4 #include <stan/math/fwd/core.hpp>
6 #include <cmath>
7 
8 namespace stan {
9  namespace math {
10 
11  template <typename T>
12  inline fvar<T> acosh(const fvar<T>& x) {
13  using std::sqrt;
14  return fvar<T>(acosh(x.val_),
15  x.d_ / sqrt(square(x.val_) - 1));
16  }
17 
18  }
19 }
20 #endif
fvar< T > sqrt(const fvar< T > &x)
Definition: sqrt.hpp:14
fvar< T > square(const fvar< T > &x)
Definition: square.hpp:14
fvar< T > acosh(const fvar< T > &x)
Definition: acosh.hpp:12

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