or Indicator</B>
<PRE>
  INFO    INTEGER
          = 0:  successful exit;
          &lt; 0:  if INFO = -i, the i-th argument had an illegal
                value;
          = 1:  the matrix pencil defined by A and B is singular.

</PRE>
<A name="Method"><B><FONT SIZE="+1">Method</FONT></B></A>
<PRE>
  Consider first that SORT = 'N'. Let

         ( A    A   )       ( B    B   )
         (  11   12 )       (  11   12 )
     A = (          ),  B = (          ),
         ( 0    A   )       ( 0    B   )
       