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asin.hpp
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#ifndef STAN_MATH_REV_SCAL_FUN_ASIN_HPP
#define STAN_MATH_REV_SCAL_FUN_ASIN_HPP
#include <stan/math/rev/core.hpp>
#include <cmath>
namespace stan {
namespace math {
namespace {
class asin_vari : public op_v_vari {
public:
explicit asin_vari(vari* avi) :
op_v_vari(std::asin(avi->val_), avi) {
}
void chain() {
avi_->adj_ += adj_ / std::sqrt(1.0 - (avi_->val_ * avi_->val_));
}
};
}
inline var asin(const var& a) {
return var(new asin_vari(a.vi_));
}
}
}
#endif
core.hpp
stan::math::sqrt
fvar< T > sqrt(const fvar< T > &x)
Definition: sqrt.hpp:15
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
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:44

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