Control Science Functions?



Dear Maxima-group,

I am a new user in the maxima world and I look for a number of functions
related to basic linear control science. Is there a Control science package
for maxima?
Is there anyone else using it for this purpose?

The typical functions I look for (maybe I have to write them myself) are:

Bandwidth( function ), bodeplot( function ), margins( function )
Transfer2statespace( function)
(with functions of the Laplace variable s)

Best regards,

			Goran