1 #ifndef STAN_MATH_FWD_SCAL_FUN_LOG_HPP 2 #define STAN_MATH_FWD_SCAL_FUN_LOG_HPP
T d_
The tangent (derivative) of this variable.
const double NOT_A_NUMBER
(Quiet) not-a-number value.
fvar< T > log(const fvar< T > &x)
T val_
The value of this variable.
var log(const var &a)
Return the natural log of the specified variable (cmath).
This template class represents scalars used in forward-mode automatic differentiation, which consist of values and directional derivatives of the specified template type.