 if WEIGHT = 'L' or 'B';
          LDDV &gt;= 1,         if WEIGHT = 'R' or 'N'.

  AW      (input) DOUBLE PRECISION array, dimension (LDAW,NW)
          If WEIGHT = 'R' or 'B', the leading NW-by-NW part of this
          array must contain the state matrix AW (of the system with
          the transfer-function matrix W) in a real Schur form.
          AW is not referenced if WEIGHT = 'L' or 'N'.

  LDAW    INTEGER
          The leading dimension of array AW.
          LDAW &gt;= MAX(1,NW), if WEIGHT = 'R' 