1 VectorXd v(10); 2 v.resize(3); 3 RowVector3d w; 4 w.resize(3); // this is legal, but has no effect 5 cout << "v: " << v.rows() << " rows, " << v.cols() << " cols" << endl; 6 cout << "w: " << w.rows() << " rows, " << w.cols() << " cols" << endl; 7