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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>
6 #include <stan/math/prim/scal/fun/square.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) {
14 using ::atanh;
15 return fvar<T>(atanh(x.val_), x.d_ / (1 - square(x.val_)));
16 }
17
18 }
19 }
20 #endif
core.hpp
stan::math::fvar::d_
T d_
Definition: fvar.hpp:14
stan::math::atanh
fvar< T > atanh(const fvar< T > &x)
Definition: atanh.hpp:13
stan
Definition: log_sum_exp.hpp:8
square.hpp
stan::math::square
fvar< T > square(const fvar< T > &x)
Definition: square.hpp:14
stan::math::fvar::val_
T val_
Definition: fvar.hpp:13
stan::math::atanh
var atanh(const var &a)
The inverse hyperbolic tangent function for variables (C99).
Definition: atanh.hpp:69
stan::math::fvar
Definition: fvar.hpp:12

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