MatrixXf M1(3, 3);  // Column-major storage
M1 << 1, 2, 3, 4, 5, 6, 7, 8, 9;

Map<RowVectorXf> v1(M1.data(), M1.size());
cout << "v1:" << endl << v1 << endl;

Matrix<float, Dynamic, Dynamic, RowMajor> M2(M1);
Map<RowVectorXf> v2(M2.data(), M2.size());
cout << "v2:" << endl << v2 << endl;