Stan Math Library  2.20.0
reverse mode automatic differentiation
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 <stan/math/fwd/meta.hpp>
5 #include <stan/math/fwd/core.hpp>
8 
9 namespace stan {
10 namespace math {
11 
21 template <typename T>
22 inline fvar<T> atanh(const fvar<T>& x) {
23  return fvar<T>(atanh(x.val_), x.d_ / (1 - square(x.val_)));
24 }
25 
26 } // namespace math
27 } // namespace stan
28 #endif
T d_
The tangent (derivative) of this variable.
Definition: fvar.hpp:50
fvar< T > atanh(const fvar< T > &x)
Return inverse hyperbolic tangent of specified value.
Definition: atanh.hpp:22
fvar< T > square(const fvar< T > &x)
Definition: square.hpp:12
T val_
The value of this variable.
Definition: fvar.hpp:45
This template class represents scalars used in forward-mode automatic differentiation, which consist of values and directional derivatives of the specified template type.
Definition: fvar.hpp:41

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