OL is used
          as a lower bound for the reciprocal condition number of
          that matrix; a matrix whose estimated condition number is
          less than 1/TOL is considered to be nonsingular. If the
          user sets TOL &lt;= 0, then a default tolerance, defined by
          TOLDEF = EPS, is used instead, where EPS is the machine
          precision (see LAPACK Library routine DLAMCH).
          This parameter is not referenced if JOBB = 'G'.

</PRE>
<B>Workspace</B>
<PRE>
  IWORK   INTEGER a