text: #ifndef STAN_MATH_REV_MAT_FUN_ROWS_DOT_PRODUCT_HPP
  #define STAN_MATH_REV_MAT_FUN_ROWS_DOT_PRODUCT_HPP
  
  #include <stan/math/prim/mat/fun/Eigen.hpp>
  #include <stan/math/prim/mat/fun/typedefs.hpp>
  #include <stan/math/prim/mat/err/check_vector.hpp>
  #include <stan/math/prim/arr/err/check_matching_sizes.hpp>
  #include <stan/math/prim/scal/fun/value_of.hpp>
  #include <stan/math/rev/core.hpp>
  #include <stan/math/rev/mat/fun/typedefs.hpp>
  #include <stan/math/rev/scal/fun/value_of.hpp>
  #include <stan/math/rev/mat/fun/dot_product.hpp>
  #include <boost/utility/enable_if.hpp>
  #include <boost/type_traits.hpp>
  #include <vector>
  
  namespace stan {
  namespace math {
  
  template <typename T1, int R1, int C1, typename T2, int R2, int C2>
  inline typename boost::enable_if_c<boost::is_same<T1, var>::value
                                         || boost::is_same<T2, var>::value,
                                     Eigen::Matrix<var, R1, 1> >::type
  rows_dot_product(const Eigen::Matrix<T1, R1, C1>& v1,
                   const Eigen::Matrix<T2, R2, C2>& v2) {
    check_matching_sizes("dot_product", "v1", v1, "v2", v2);
    Eigen::Matrix<var, R1, 1> ret(v1.rows(), 1);
    for (size_type j = 0; j < v1.rows(); ++j) {
      ret(j) = var(new dot_product_vari<T1, T2>(v1.row(j), v2.row(j)));
    }
    return ret;
  }
  
  }  // namespace math
  }  // namespace stan
  #endif
  