1 #ifndef STAN_MATH_PRIM_FUN_SCALED_ADD_HPP
2 #define STAN_MATH_PRIM_FUN_SCALED_ADD_HPP
3 
4 #include <stan/math/prim/meta.hpp>
5 #include <vector>
6 #include <cstddef>
7 
8 namespace stan {
9 namespace math {
10 
scaled_add(std::vector<double> & x,const std::vector<double> & y,double lambda)11 inline void scaled_add(std::vector<double>& x, const std::vector<double>& y,
12                        double lambda) {
13   for (size_t i = 0; i < x.size(); ++i) {
14     x[i] += lambda * y[i];
15   }
16 }
17 
18 }  // namespace math
19 }  // namespace stan
20 
21 #endif
22