File:Plog4.png

$y(n)=h(n)=\frac{1}{4} \left(4 n-(3 n\!+\!2)  \sin \left(\frac{\pi n}{2}\right)-(n\!+\!1) \cos   \left(\frac{\pi n}{2}\right)-(2 n\!+\!1) \cos   (\pi  n)+2\right) $

and $y=n$ versus real $n$

Copyleft 2011 by Dmitrii Kouznetsov. The free use is allowed.