log_inv_logit_diff.hpp

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#ifndef STAN_MATH_FWD_FUN_LOG_INV_LOGIT_DIFF_HPP
#define STAN_MATH_FWD_FUN_LOG_INV_LOGIT_DIFF_HPP
 
#include <stan/math/fwd/meta.hpp>
#include <stan/math/fwd/core.hpp>
#include <stan/math/fwd/fun/inv_logit.hpp>
#include <stan/math/fwd/fun/inv.hpp>
#include <stan/math/fwd/fun/expm1.hpp>
#include <stan/math/prim/fun/log_inv_logit_diff.hpp>
 
namespace stan {
namespace math {
 
template <typename T>
inline fvar<T> log_inv_logit_diff(const fvar<T>& x, const fvar<T>& y) {
  return fvar<T>(
      log_inv_logit_diff(x.val_, y.val_),
      -x.d_ * (inv(expm1(y.val_ - x.val_)) + inv_logit(x.val_))
          - y.d_ * (inv(expm1(x.val_ - y.val_)) + inv_logit(y.val_)));
}
 
template <typename T>
inline fvar<T> log_inv_logit_diff(const fvar<T>& x, double y) {
  return fvar<T>(log_inv_logit_diff(x.val_, y),
                 -x.d_ * (inv(expm1(y - x.val_)) + inv_logit(x.val_)));
}
 
template <typename T>
inline fvar<T> log_inv_logit_diff(double x, const fvar<T>& y) {
  return fvar<T>(log_inv_logit_diff(x, y.val_),
                 -y.d_ * (inv(expm1(x - y.val_)) + inv_logit(y.val_)));
}
 
}  // namespace math
}  // namespace stan
#endif