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reverse mode automatic differentiation
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atanh.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_ATANH_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_ATANH_HPP
3 
4 #include <math.h>
5 #include <stan/math/fwd/core.hpp>
7 #include <cmath>
8 
9 namespace stan {
10  namespace math {
11 
12  template <typename T>
13  inline fvar<T> atanh(const fvar<T>& x) {
15  using stan::math::square;
16  return fvar<T>(atanh(x.val_), x.d_ / (1 - square(x.val_)));
17  }
18 
19  }
20 }
21 #endif
fvar< T > atanh(const fvar< T > &x)
Definition: atanh.hpp:13
fvar< T > square(const fvar< T > &x)
Definition: square.hpp:15
var atanh(const var &a)
The inverse hyperbolic tangent function for variables (C99).
Definition: atanh.hpp:70

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