ss error

[address@hidden]

Hi!

I'm an octave new user so I don't understand a message from compiler:

octave:2> A=[0 1 0 0;-1000 -980 1000 980;0 0 0 1;28.57 28 -28.57 -28]
A =

   0.0000e+00   1.0000e+00   0.0000e+00   0.0000e+00
  -1.0000e+03  -9.8000e+02   1.0000e+03   9.8000e+02
   0.0000e+00   0.0000e+00   0.0000e+00   1.0000e+00
   2.8570e+01   2.8000e+01  -2.8570e+01  -2.8000e+01

octave:3> B=[0 50000 0 0]
B =

       0   50000       0       0

octave:4> C=[0 0 1 0]
C =

   0   0   1   0

octave:5> J=0
J = 0
octave:6> sys=ss(A,B,C,J)
warning: abcddim: a(4x4) and b(1x4) are not compatible
error: a(4x4), b(1x4), c(1x4), d(1x1); incompatible
error: called from:
error:   /usr/share/octave/packages/3.2/control-1.0.11/ss.m at line 210,
column 5

I believe an dimension error in my 4x4 system. Is that? there is another
function to solve 4x4 state variable form?

thank


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