  compute all the eigenvalues of B (see LAPACK Library
                routine DGEES);
          &gt; M:  if a singular matrix was encountered whilst solving
                for the (INFO-M)-th column of matrix X.

</PRE>
<A name="Method"><B><FONT SIZE="+1">Method</FONT></B></A>
<PRE>
  The matrix A is transformed to upper Hessenberg form H = U'AU by
  the orthogonal transformation matrix U; matrix B' is transformed
  to real upper Schur form S = Z'B'Z using the orthogonal
  transformation matrix Z. The mat