E PRECISION array, dimension (LDX,IPAR(1))
          If an exact solution is available (NR = 1.1, 1.2, 2.1,
          2.3-2.6, 3.2), then the leading N-by-N part of this array
          contains the solution matrix X in conventional storage
          mode. Otherwise, X is not referenced.

  LDX     INTEGER
          The leading dimension of array X.  LDX &gt;= 1, and
          LDX &gt;= N if NR = 1.1, 1.2, 2.1, 2.3-2.6, 3.2.

</PRE>
<B>Workspace</B>
<PRE>
  DWORK   DOUBLE PRECISION array, dimension (LDWORK)