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asin.hpp
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1 #ifndef STAN_MATH_REV_SCAL_FUN_ASIN_HPP
2 #define STAN_MATH_REV_SCAL_FUN_ASIN_HPP
3
4 #include <stan/math/rev/core.hpp>
5 #include <cmath>
6
7 namespace stan {
8 namespace math {
9
10 namespace {
11 class asin_vari : public op_v_vari {
12 public:
13 explicit asin_vari(vari* avi) :
14 op_v_vari(std::asin(avi->val_), avi) {
15 }
16 void chain() {
17 avi_->adj_ += adj_ / std::sqrt(1.0 - (avi_->val_ * avi_->val_));
18 }
19 };
20 }
21
58 inline var asin(const var& a) {
59 return var(new asin_vari(a.vi_));
60 }
61
62 }
63 }
64 #endif
core.hpp
stan::math::sqrt
fvar< T > sqrt(const fvar< T > &x)
Definition: sqrt.hpp:14
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::asin
fvar< T > asin(const fvar< T > &x)
Definition: asin.hpp:12
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:42

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