 CV.
          LDCV &gt;= MAX(1,PV), if WEIGHT = 'L' or 'B';
          LDCV &gt;= 1,         if WEIGHT = 'R' or 'N'.

  DV      (input) DOUBLE PRECISION array, dimension (LDDV,P)
          If WEIGHT = 'L' or 'B', the leading PV-by-P part of this
          array must contain the feedthrough matrix DV of the system
          with the transfer-function matrix V.
          DV is not referenced if WEIGHT = 'R' or 'N'.

  LDDV    INTEGER
          The leading dimension of array DV.
          LDDV &gt;= MAX(1,PV),