
          = 'D':  Equation (2), discrete-time case.

  FACT    CHARACTER*1
          Specifies whether or not the Schur factorization of the
          matrix A is supplied on entry, as follows:
          = 'F':  On entry, A and Q contain the factors from the
                  Schur factorization of the matrix A;
          = 'N':  The Schur factorization of A will be computed
                  and the factors will be stored in A and Q.

  TRANS   CHARACTER*1
          Specifies the form of op(K) to be used,