Stan Math Library  2.11.0
reverse mode automatic differentiation
cosh.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_COSH_HPP
2 #define STAN_MATH_REV_SCAL_FUN_COSH_HPP
3 
4 #include <stan/math/rev/core.hpp>
5 #include <cmath>
6 #include <valarray>
7 
8 namespace stan {
9  namespace math {
10 
11  namespace {
12  class cosh_vari : public op_v_vari {
13  public:
14  explicit cosh_vari(vari* avi) :
15  op_v_vari(std::cosh(avi->val_), avi) {
16  }
17  void chain() {
18  avi_->adj_ += adj_ * std::sinh(avi_->val_);
19  }
20  };
21  }
22 
50  inline var cosh(const var& a) {
51  return var(new cosh_vari(a.vi_));
52  }
53 
54  }
55 }
56 #endif
fvar< T > cosh(const fvar< T > &x)
Definition: cosh.hpp:13
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:31
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:43
fvar< T > sinh(const fvar< T > &x)
Definition: sinh.hpp:14

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