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From: "Rajiv Singh" <rajiv_singh@msn.com>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Changing ARX model to State Space model
Date: Wed, 3 Dec 2008 18:39:48 -0500
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If you ARX model was created using system identification toolbox, you can 
use the SS command; or use SSDATA.

sys = ss(model('measure'))  %if you only want the measured component of 
model (ignore noise component, such that y = B/Au is converted)


hth,
rajiv

"Joseph Ho" <hoyoku@yahoo.com> wrote in message 
news:gec00a$qep$1@fred.mathworks.com...
> Hi, does anyone know how to change an ARX model to a State Space model?