@Test public void testGetValues() { DenseMatrix m = new DenseMatrix(10, 10); for (int i = 0; i < 10; i++) { for (int j = 0; j < 10; j++) { m.set(i, j, 10 * i + j); } } double[][] values = m.getBackingStructure(); Assert.assertEquals(values.length, 10); Assert.assertEquals(values[0].length, 10); Assert.assertEquals(values[9][9], 99.0, 0.0); }