1 #ifndef STAN_MATH_FWD_SCAL_FUN_BINOMIAL_COEFFICIENT_LOG_HPP
2 #define STAN_MATH_FWD_SCAL_FUN_BINOMIAL_COEFFICIENT_LOG_HPP
6 #include <boost/math/special_functions/digamma.hpp>
18 const double cutoff = 1000;
19 if ((x1.
val_ < cutoff) || (x1.
val_ - x2.
val_ < cutoff)) {
47 const double cutoff = 1000;
48 if ((x1.
val_ < cutoff) || (x1.
val_ - x2 < cutoff)) {
54 x2 * x1.
d_ / (x1.
val_ - x2)
60 + x1.
d_ / (12.0 * (x1.
val_ - x2) * (x1.
val_ - x2)));
70 const double cutoff = 1000;
71 if ((x1 < cutoff) || (x1 - x2.
val_ < cutoff)) {
80 - x2.
d_ / (12.0 * (x1 - x2.
val_) * (x1 - x2.
val_))
81 + x2.
d_ * (x1 + 0.5) / (x1 - x2.
val_)
fvar< T > binomial_coefficient_log(const fvar< T > &x1, const fvar< T > &x2)
fvar< T > log(const fvar< T > &x)
fvar< T > digamma(const fvar< T > &x)