def test_norms(self):
a = DenseVector([0, 2, 3, -1])
self.assertAlmostEqual(a.norm(2), 3.742, 3)
self.assertTrue(a.norm(1), 6)
self.assertTrue(a.norm(inf), 3)
a = SparseVector(4, [0, 2], [3, -4])
self.assertAlmostEqual(a.norm(2), 5)
self.assertTrue(a.norm(1), 7)
self.assertTrue(a.norm(inf), 4)
tmp = SparseVector(4, [0, 2], [3, 0])
self.assertEqual(tmp.numNonzeros(), 1)
