if WEIGHT = 'L' or 'N'.

  CW      (input) DOUBLE PRECISION array, dimension (LDCW,NW)
          If WEIGHT = 'R' or 'B', the leading M-by-NW part of this
          array must contain the output matrix CW of the system with
          the transfer-function matrix W.
          CW is not referenced if WEIGHT = 'L' or 'N'.

  LDCW    INTEGER
          The leading dimension of array CW.
          LDCW &gt;= MAX(1,M), if WEIGHT = 'R' or 'B';
          LDCW &gt;= 1,        if WEIGHT = 'L' or 'N'.

  DW      (input)