@Test

public void testParzenMethod() {

    for (int len = 1; len < 12; ++len) {
          System.out.println(new WindowFunction(WindowType.Parzen, len).compute(i -> fn.get(Math.abs(i))));
        new WindowFunction(WindowType.Parzen, len).compute(i -> fn.get(Math.abs(i)));
    }
}