nstable part of the
                given system; in this case NR is set equal to the
                order of the ALPHA-unstable part.

</PRE>
<B>Error Indicator</B>
<PRE>
  INFO    INTEGER
          = 0:  successful exit;
          &lt; 0:  if INFO = -i, the i-th argument had an illegal
                value;
          = 1:  the computation of the ordered real Schur form of A
                failed;
          = 2:  the reduction of the Hamiltonian matrix to real
                Schur form failed;
        