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