1 #ifndef STAN_MATH_REV_SCAL_FUN_CALCULATE_CHAIN_HPP 2 #define STAN_MATH_REV_SCAL_FUN_CALCULATE_CHAIN_HPP 3 4 #include <valarray> 5 6 namespace stan { 7 namespace math { 8 calculate_chain(double x,double val)9inline double calculate_chain(double x, double val) { 10 return std::exp(x - val); // works out to inv_logit(x) 11 } 12 13 } // namespace math 14 } // namespace stan 15 #endif 16