Stan Math Library  2.14.0
reverse mode automatic differentiation
bessel_second_kind.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_BESSEL_SECOND_KIND_HPP
2 #define STAN_MATH_REV_SCAL_FUN_BESSEL_SECOND_KIND_HPP
3 
4 #include <stan/math/rev/core.hpp>
7 
8 namespace stan {
9  namespace math {
10 
11  namespace {
12 
13  class bessel_second_kind_dv_vari : public op_dv_vari {
14  public:
15  bessel_second_kind_dv_vari(int a, vari* bvi) :
16  op_dv_vari(bessel_second_kind(a, bvi->val_), a, bvi) {
17  }
18  void chain() {
19  bvi_->adj_ += adj_
20  * (ad_ * bessel_second_kind(ad_, bvi_->val_)
21  / bvi_->val_
22  - bessel_second_kind(ad_ + 1, bvi_->val_));
23  }
24  };
25  }
26 
27  inline var bessel_second_kind(int v,
28  const var& a) {
29  return var(new bessel_second_kind_dv_vari(v, a.vi_));
30  }
31 
32  }
33 }
34 #endif
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:30
fvar< T > bessel_second_kind(int v, const fvar< T > &z)
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:42

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