1 #ifndef STAN_MATH_FWD_SCAL_FUN_LGAMMA_HPP 2 #define STAN_MATH_FWD_SCAL_FUN_LGAMMA_HPP
T d_
The tangent (derivative) of this variable.
fvar< T > lgamma(const fvar< T > &x)
Return the natural logarithm of the gamma function applied to the specified argument.
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.
fvar< T > digamma(const fvar< T > &x)
Return the derivative of the log gamma function at the specified argument.