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From: Dhiral on 26 May 2010 13:35
Hello,

I have a discrete transfer function for a controller
0.3778 (z-0.8824)
C = -------------------------
(z-1) (z-0.9851)

with sample time 0.001s. I want state space model (ie. matrices A,B,C,D) such that

x(k+1) = A*x(k) + B*u(k)
y(k) = C*x(k) + D*u(k) .

MATLAB help says its same as for continuous transfer function (tf2ss) but how does it recognize from input arguments (num , den) that my transfer function is discrete one ?
by default it assumes it to be a continuous transfer function.

Please help me or suggest a diff method to get state space model of a discrete transfer function.
Thank you.
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