@Test
	public void toString_test() {
		
		try{
		double [][]mat= {{1.0,2.0}, {3.0,1.0}};
		String matStr = Matrix.toString(mat);
		String expStr=("                     1.0                     2.0\n"+
				       "                     3.0                     1.0\n");
		Assert.assertNotSame(matStr, expStr);
		}
		
		catch (Exception e) {
			// TODO Auto-generated catch block
			fail("Not yet implemented");
		}
	}