1 #ifndef STAN_MATH_REV_SCAL_FUN_DIGAMMA_HPP 2 #define STAN_MATH_REV_SCAL_FUN_DIGAMMA_HPP
The variable implementation base class.
Independent (input) and dependent (output) variables for gradients.
const double val_
The value of this variable.
fvar< T > trigamma(const fvar< T > &u)
Return the value of the trigamma function at the specified argument (i.e., the second derivative of t...
vari * vi_
Pointer to the implementation of this variable.
double adj_
The adjoint of this variable, which is the partial derivative of this variable with respect to the ro...
void chain()
Apply the chain rule to this variable based on the variables on which it depends. ...
fvar< T > digamma(const fvar< T > &x)
Return the derivative of the log gamma function at the specified argument.