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tanh.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_TANH_HPP
2 #define STAN_MATH_REV_SCAL_FUN_TANH_HPP
3
4 #include <stan/math/rev/core.hpp>
5 #include <cmath>
6
7 namespace stan {
8 namespace math {
9
10 namespace {
11 class tanh_vari : public op_v_vari {
12 public:
13 explicit tanh_vari(vari* avi) :
14 op_v_vari(std::tanh(avi->val_), avi) {
15 }
16 void chain() {
17 double cosh = std::cosh(avi_->val_);
18 avi_->adj_ += adj_ / (cosh * cosh);
19 }
20 };
21 }
22
50 inline var tanh(const var& a) {
51 return var(new tanh_vari(a.vi_));
52 }
53
54 }
55 }
56 #endif
core.hpp
stan::math::cosh
fvar< T > cosh(const fvar< T > &x)
Definition: cosh.hpp:13
stan
Definition: log_sum_exp.hpp:8
std
Definition: std_numeric_limits.hpp:7
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:30
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:42
stan::math::tanh
fvar< T > tanh(const fvar< T > &x)
Definition: tanh.hpp:12

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