DWORK(4) is set
          to 1 if JOBB = 'G' or SCAL = 'N'.

  LDWORK  INTEGER
          The length of the array DWORK.
          LDWORK &gt;= MAX(7*(2*N+1)+16,16*N),           if JOBB = 'G';
          LDWORK &gt;= MAX(7*(2*N+1)+16,16*N,2*N+M,3*M), if JOBB = 'B'.
          For optimum performance LDWORK should be larger.

  BWORK   LOGICAL array, dimension (2*N)

</PRE>
<B>Warning Indicator</B>
<PRE>
  IWARN   INTEGER
          = 0:  no warning;
          = 1:  the computed solution may be inaccurate due to