1 #include <iostream> 2 #include <Eigen/Dense> 3 4 using namespace Eigen; 5 main()6int main() 7 { 8 Matrix2d a; 9 a << 1, 2, 10 3, 4; 11 MatrixXd b(2,2); 12 b << 2, 3, 13 1, 4; 14 std::cout << "a + b =\n" << a + b << std::endl; 15 std::cout << "a - b =\n" << a - b << std::endl; 16 std::cout << "Doing a += b;" << std::endl; 17 a += b; 18 std::cout << "Now a =\n" << a << std::endl; 19 Vector3d v(1,2,3); 20 Vector3d w(1,0,0); 21 std::cout << "-v + w - v =\n" << -v + w - v << std::endl; 22 } 23