columns_dot_product.hpp

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#ifndef STAN_MATH_PRIM_FUN_COLUMNS_DOT_PRODUCT_HPP
#define STAN_MATH_PRIM_FUN_COLUMNS_DOT_PRODUCT_HPP
 
#include <stan/math/prim/err.hpp>
#include <stan/math/prim/fun/Eigen.hpp>
 
namespace stan {
namespace math {
 
template <typename Mat1, typename Mat2,
          require_all_eigen_t<Mat1, Mat2>* = nullptr,
          require_all_not_eigen_vt<is_var, Mat1, Mat2>* = nullptr>
inline Eigen::Matrix<return_type_t<Mat1, Mat2>, 1, Mat1::ColsAtCompileTime>
columns_dot_product(const Mat1& v1, const Mat2& v2) {
  check_matching_sizes("columns_dot_product", "v1", v1, "v2", v2);
  return v1.cwiseProduct(v2).colwise().sum();
}
 
}  // namespace math
}  // namespace stan
 
#endif