Stan Math Library  2.14.0
reverse mode automatic differentiation
digamma.hpp
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1 #ifndef STAN_MATH_FWD_SCAL_FUN_DIGAMMA_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_DIGAMMA_HPP
3 
4 #include <stan/math/fwd/core.hpp>
5 
8 
9 namespace stan {
10  namespace math {
11 
21  template <typename T>
22  inline fvar<T> digamma(const fvar<T>& x) {
23  return fvar<T>(digamma(x.val_), x.d_ * trigamma(x.val_));
24  }
25  }
26 }
27 #endif
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...
Definition: trigamma.hpp:21
fvar< T > digamma(const fvar< T > &x)
Return the derivative of the log gamma function at the specified argument.
Definition: digamma.hpp:22

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