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ss2tf & MIMO


From: Alvin W
Subject: ss2tf & MIMO
Date: Sun, 30 May 2010 09:11:10 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.8) Gecko/20100329 Thunderbird/3.0.3

Does the ss2tf command from control package version 1.0.11 support MIMO?
I was attempting to transform the following matrices into transfer
functions, but it gives me an error.

octave:1> A
A =

   -0.015227    0.038974           0   -0.087786
    -0.17471     -1.0092     0.98349          -0
           0     -13.901      -2.367           0
           0           0           1           0

octave:2> B
B =

          -0
    -0.10468
     -20.381
           0

octave:3> C
C =

Diagonal Matrix

           1           0           0           0
           0           1           0           0
           0           0           1           0
           0           0           0           1

octave:4> D
D =

           0
           0
           0
           0

octave:5> [num,den] = ss2tf(A,B,C,D)
error: ss2tf: not SISO system: m=1, p=4

Any idea? The above commands worked fine on MATLAB.

Btw, where can I download the beta version of the control package?

Thanks,

Al



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