tgamma.hpp

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#ifndef STAN_MATH_FWD_FUN_TGAMMA_HPP
#define STAN_MATH_FWD_FUN_TGAMMA_HPP
 
#include <stan/math/fwd/meta.hpp>
#include <stan/math/fwd/core.hpp>
#include <stan/math/prim/fun/tgamma.hpp>
#include <boost/math/special_functions/digamma.hpp>
 
namespace stan {
namespace math {
 
template <typename T>
inline fvar<T> tgamma(const fvar<T>& x) {
  T u = tgamma(x.val_);
  return fvar<T>(u, x.d_ * u * digamma(x.val_));
}
 
}  // namespace math
}  // namespace stan
#endif