1 #ifndef STAN_MATH_FWD_CORE_OPERATOR_UNARY_MINUS_HPP 2 #define STAN_MATH_FWD_CORE_OPERATOR_UNARY_MINUS_HPP fvar< T > operator-(const fvar< T > &x1, const fvar< T > &x2)
Return the difference of the specified arguments.
T d_
The tangent (derivative) of this variable.
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.