square.hpp
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#ifndef STAN_MATH_REV_SCAL_FUN_SQUARE_HPP
#define STAN_MATH_REV_SCAL_FUN_SQUARE_HPP
#include <stan/math/rev/core.hpp>
namespace stan {
namespace math {
namespace {
class square_vari : public op_v_vari {
public:
explicit square_vari(vari* avi) :
op_v_vari(avi->val_ * avi->val_, avi) {
}
void chain() {
avi_->adj_ += adj_ * 2.0 * avi_->val_;
}
};
}
inline var square(const var& x) {
return var(new square_vari(x.vi_));
}
}
}
#endif
core.hpp
stan
Definition: log_sum_exp.hpp:8
stan::math::var
Independent (input) and dependent (output) variables for gradients.
Definition: var.hpp:30
stan::math::square
fvar< T > square(const fvar< T > &x)
Definition: square.hpp:14
stan::math::var::vi_
vari * vi_
Pointer to the implementation of this variable.
Definition: var.hpp:42

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