1 #ifndef STAN_MATH_PRIM_SCAL_FUN_LOG_DIFF_EXP_HPP
2 #define STAN_MATH_PRIM_SCAL_FUN_LOG_DIFF_EXP_HPP
5 #include <boost/math/tools/promotion.hpp>
6 #include <boost/throw_exception.hpp>
48 template <
typename T1,
typename T2>
49 inline typename boost::math::tools::promote_args<T1, T2>::type
52 return std::numeric_limits<double>::quiet_NaN();
fvar< T > log_diff_exp(const fvar< T > &x1, const fvar< T > &x2)
fvar< T > log1m_exp(const fvar< T > &x)