1 Matrix3d m = Matrix3d::Zero();
2 m.triangularView<Eigen::Upper>().setOnes();
3 cout << "Here is the matrix m:\n" << m << endl;
4 Matrix3d n = Matrix3d::Ones();
5 n.triangularView<Eigen::Lower>() *= 2;
6 cout << "Here is the matrix n:\n" << n << endl;
7 cout << "And now here is m.inverse()*n, taking advantage of the fact that"
8         " m is upper-triangular:\n"
9      << m.triangularView<Eigen::Upper>().solve(n) << endl;
10 cout << "And this is n*m.inverse():\n"
11      << m.triangularView<Eigen::Upper>().solve<Eigen::OnTheRight>(n);
12