n, D.
      LAPACK Users' Guide: Second Edition.
      SIAM, Philadelphia, 1995.

</PRE>
<A name="Numerical Aspects"><B><FONT SIZE="+1">Numerical Aspects</FONT></B></A>
<PRE>
  No rounding errors appear if JOB = 'P'.

</PRE>
<A name="Comments"><B><FONT SIZE="+1">Further Comments</FONT></B></A>
<PRE>
  If THRESH = -2, the increase of the maximum norm of the scaled
  submatrices, compared to the maximum norm of the initial
  submatrices, is bounded by MXGAIN = 100.
  If THRESH = -2, or THRESH = -4, the maximu