rray, dimension (LIWORK)
          LIWORK &gt;= MAX(1,M,2*N) if JOBB = 'B';
          LIWORK &gt;= MAX(1,2*N)   if JOBB = 'G'.

  DWORK   DOUBLE PRECISION array, dimension (LDWORK)
          On exit, if INFO = 0, DWORK(1) returns the optimal value
          of LDWORK. If JOBB = 'B' and N &gt; 0, DWORK(2) returns the
          reciprocal of the condition number of the M-by-M bottom
          right lower triangular matrix obtained while compressing
          the matrix pencil of order 2N+M to obtain a pencil 