r 'B') returned
                with INFO &lt;&gt; 0.
          In addition, if INIT = 'L' or 'B', i could also be
          = 4:  if a Lyapunov equation could not be solved;
          = 5:  if the identified linear system is unstable;
          = 6:  if the QR algorithm failed on the state matrix
                of the identified linear system.
          The digit k is normally 0, but if INIT = 'L' or 'B', it
          can have a value in the range 1 to 10 (see IB01AD/IB01BD).

</PRE>
<A name="Method"><B><