

  D       (input) DOUBLE PRECISION array, dimension (LDD,M)
          The leading P-by-M part of this array must contain the
          direct transmission matrix D of the system.

  LDD     INTEGER
          The leading dimension of array D.  LDD &gt;= MAX(1,P).

  RANK    (output) INTEGER
          The normal rank of the transfer-function matrix.

</PRE>
<B>Tolerances</B>
<PRE>
  TOL     DOUBLE PRECISION
          A tolerance used in rank decisions to determine the
          effective rank, which is defi