00001 Matrix4d m = Vector4d(1,2,3,4).asDiagonal(); 00002 cout << "Here is the matrix m:" << endl << m << endl; 00003 cout << "Here is m.fixed<2, 2>(2, 2):" << endl << m.block<2, 2>(2, 2) << endl; 00004 m.block<2, 2>(2, 0) = m.block<2, 2>(2, 2); 00005 cout << "Now the matrix m is:" << endl << m << endl;