function chkCtrlObsv(ss,s)
    P=ctrb(ss.A,ss.B);
    if rank(ss.A)==rank(P)
      ct='';%controlable
    else
      ct='not ';%not controlable
    end

    Q=obsv(ss.A,ss.C);
    if rank(ss.A)==rank(Q)
      ob='';%sys observable
    else
      ob='not ';%not observable
    end
    disp([s,' is ',ct,'controlable and ',ob,'observable.']); 
  end