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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 
11  namespace math {
12 
13  template <typename T>
14  inline
15  fvar<T>
16  digamma(const fvar<T>& x) {
17  using stan::math::digamma;
19  return fvar<T>(digamma(x.val_), x.d_ * trigamma(x.val_));
20  }
21  }
22 }
23 #endif
T trigamma(T x)
Definition: trigamma.hpp:50
fvar< T > digamma(const fvar< T > &x)
Definition: digamma.hpp:16

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