|  | #include <iostream> | 
|  | #include <Eigen/Dense> | 
|  |  | 
|  | int main() { | 
|  | Eigen::Matrix2d mat; | 
|  | mat << 1, 2, 3, 4; | 
|  | Eigen::Vector2d u(-1, 1), v(2, 0); | 
|  | std::cout << "Here is mat*mat:\n" << mat * mat << std::endl; | 
|  | std::cout << "Here is mat*u:\n" << mat * u << std::endl; | 
|  | std::cout << "Here is u^T*mat:\n" << u.transpose() * mat << std::endl; | 
|  | std::cout << "Here is u^T*v:\n" << u.transpose() * v << std::endl; | 
|  | std::cout << "Here is u*v^T:\n" << u * v.transpose() << std::endl; | 
|  | std::cout << "Let's multiply mat by itself" << std::endl; | 
|  | mat = mat * mat; | 
|  | std::cout << "Now mat is mat:\n" << mat << std::endl; | 
|  | } |