@Test
	public void identity_test() {
		
		try{
		double [][]exp= {{1.0,0.0}, {0.0,1.0}};
		double[][]result = Matrix.identity(2);
		Assert.assertArrayEquals(exp, result);
		}		
		catch (Exception e) {
			// TODO Auto-generated catch block
			fail("Not yet implemented");
		}
	}