why minreal command does not work?

also,this is my command window,would you please to tell me why mireal command does not work?

>> s=tf('s');
>> X0=[1;1];A=[-3 2;-2 -3];B=[1;0];C=[0 1];
>> U=1/s;
>> Y=zpk(minreal(C*inv(s*eye(2)-A)*(X0+B*U)))

Y =

    (s+2) (s-1) (s^2 + 6s + 13)
    ---------------------------
        s (s^2 + 6s + 13)^2

Continuous-time zero/pole/gain model.

[Walter Roberson]

I thought at first you were referring to realmin(), but I see that minreal() is a function in the Control Systems Toolbox.

http://www.mathworks.com/help/control/ref/minreal.html