1 #ifndef STAN_MATH_REV_SCAL_FUN_SQRT_HPP
2 #define STAN_MATH_REV_SCAL_FUN_SQRT_HPP
11 class sqrt_vari :
public op_v_vari {
13 explicit sqrt_vari(vari* avi) :
14 op_v_vari(
std::
sqrt(avi->val_), avi) {
17 avi_->adj_ += adj_ / (2.0 * val_);
51 return var(
new sqrt_vari(a.
vi_));
fvar< T > sqrt(const fvar< T > &x)
Independent (input) and dependent (output) variables for gradients.
vari * vi_
Pointer to the implementation of this variable.