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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>
5 #include <stan/math/prim/scal/fun/constants.hpp>
6 #include <stan/math/prim/scal/fun/bessel_second_kind.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(stan::math::bessel_second_kind(a, bvi->val_), a, bvi) {
17 }
18 void chain() {
19 bvi_->adj_ += adj_
20 * (ad_ * stan::math::bessel_second_kind(ad_, bvi_->val_)
21 / bvi_->val_
22 - stan::math::bessel_second_kind(ad_ + 1, bvi_->val_));
23 }
24 };
25 }
26
27 inline var bessel_second_kind(const int& v,
28 const var& a) {
29 return var(new bessel_second_kind_dv_vari(v, a.vi_));
30 }
31
32 }
33 }
34 #endif
core.hpp
stan
Definition: log_sum_exp.hpp:8
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:31
stan::math::bessel_second_kind
fvar< T > bessel_second_kind(int v, const fvar< T > &z)
Definition: bessel_second_kind.hpp:15
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:43
constants.hpp
bessel_second_kind.hpp

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