1 #ifndef STAN_MATH_REV_SCAL_FUN_ATAN_HPP
2 #define STAN_MATH_REV_SCAL_FUN_ATAN_HPP
12 class atan_vari :
public op_v_vari {
14 explicit atan_vari(vari* avi) :
15 op_v_vari(std::
atan(avi->val_), avi) {
18 avi_->adj_ += adj_ / (1.0 + (avi_->val_ * avi_->val_));
56 return var(
new atan_vari(a.
vi_));
Independent (input) and dependent (output) variables for gradients.
fvar< T > atan(const fvar< T > &x)
vari * vi_
Pointer to the implementation of this variable.