All Classes Namespaces Files Functions Variables Typedefs Enumerator Friends Macros Groups
cos.hpp
Go to the documentation of this file.
#ifndef STAN_MATH_REV_SCAL_FUN_COS_HPP
#define STAN_MATH_REV_SCAL_FUN_COS_HPP
#include <stan/math/rev/core.hpp>
#include <cmath>
namespace stan {
namespace math {
namespace {
class cos_vari : public op_v_vari {
public:
explicit cos_vari(vari* avi) :
op_v_vari(std::cos(avi->val_), avi) {
}
void chain() {
avi_->adj_ -= adj_ * std::sin(avi_->val_);
}
};
}
inline var cos(const var& a) {
return var(new cos_vari(a.vi_));
}
}
}
#endif
stan::math::cos
fvar< T > cos(const fvar< T > &x)
Definition: cos.hpp:13
core.hpp
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:32
stan::math::sin
fvar< T > sin(const fvar< T > &x)
Definition: sin.hpp:14
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:44

[ Stan Home Page ] © 2011–2015, Stan Development Team.