m1.put(2, 1.9);
m1.put(3, 3.0);
assertEquals(m1.length(), 4.2308393, 10E-6);
m1.normalize();
assertEquals(m1.get(1), 0.5436274, 10E-6);
assertEquals(m1.get(2), 0.44908348, 10E-6);
assertEquals(m1.get(3), 0.70907915, 10E-6);
assertEquals(m1.length(), 1, 10E-6);