@Test(expectedExceptions = IllegalArgumentException.class)
 public void testTransformNullParameters() {
   PARAMS.transform(null);
 }
 @Test(expectedExceptions = IllegalArgumentException.class)
 public void testTransformWrongParameters() {
   PARAMS.transform(new DoubleMatrix1D(new double[] {1, 2}));
 }
 @Test
 public void testTransformAndInverse() {
   final DoubleMatrix1D functionParameters = new DoubleMatrix1D(new double[] {1, 2, 6, 4});
   assertEquals(PARAMS.inverseTransform(PARAMS.transform(functionParameters)), functionParameters);
 }