O.k., thanks for your help in cleaning up the code and checking in. As a FYI, I doubled checked the example from the link to make sure impinvar gives the same result as Matlab. Fortunately, this turns out to be the case.
From: CarnŽ Draug <firstname.lastname@example.org>
To: Rudy Eschauzier <email@example.com>
Cc: Juan Manuel Parrilla Gutiťrrez <firstname.lastname@example.org>;
Sent: Tuesday, October 11, 2011 2:59 PM
Subject: Re: [OctDev] Impulse invariance transform implementation
Ok. I had just followed the examples on this page
http://www.uccs.edu/~cfelton/ece5655/chp8_matlab.html to remove those
entries. I'll commit those changes now. Thank you a lot for your time
improving this. The whole community wins.