          A tolerance below which matrix elements are considered
          to be zero. If the user sets TOL to be less than (or
          equal to) zero then the tolerance is taken as
          EPS * MAX( ABS(A(I,J)), ABS(E(I,J)) ), where EPS is the
          machine precision (see LAPACK Library routine DLAMCH),
          I = 1,2,...,M and J = 1,2,...,N.

</PRE>
<B>Workspace</B>
<PRE>
  IWORK   INTEGER array, dimension (N)

</PRE>
<B>Error Indicator</B>
<PRE>
  INFO    INTEGER
          = 0:  successful ex