#includeIn this example, we create a 3x3 matrix `m` and a 3-dimensional dense vector `v`. We then compute the matrix-vector product `m * v` and store the result in another dense vector `result`. Finally, we print out the result. The DenseVector class is part of the Eigen library, which is a package library for C++.#include int main() { Eigen::MatrixXd m(3,3); m << 1,2,3, 4,5,6, 7,8,9; Eigen::VectorXd v(3); v << 1,2,3; Eigen::VectorXd result = m * v; std::cout << result << std::endl; return 0; }