1 #ifndef STAN_MATH_FWD_SCAL_FUN_INV_SQRT_HPP 2 #define STAN_MATH_FWD_SCAL_FUN_INV_SQRT_HPP
fvar< T > inv_sqrt(const fvar< T > &x)
T d_
The tangent (derivative) of this variable.
fvar< T > sqrt(const fvar< T > &x)
T val_
The value of this variable.
This template class represents scalars used in forward-mode automatic differentiation, which consist of values and directional derivatives of the specified template type.