@Test
	public void square_test() {
		
		try{
		double [][]mat= {{3.0,2.0}, {1.0,3.0}};
		double[][]result = Matrix.square(mat);
		double [][]exp= {{13.0,9.0}, {9.0,10.0}};
		Assert.assertArrayEquals(exp, result);
		}		
		catch (Exception e) {
			// TODO Auto-generated catch block
			fail("Not yet implemented");
		}
	}