the array A.  LDA &gt;= MAX(1,N).

  Q       (input or output) COMPLEX*16 array, dimension (LDQ,N)
          On entry, if FACT = 'F', then the leading N-by-N part of
          this array must contain the unitary matrix Q of the Schur
          factorization of A.
          Otherwise, Q need not be set on entry.
          On exit, the leading N-by-N part of this array contains
          the unitary matrix Q of the Schur factorization of A.
          The contents of the array Q is not modified if FACT = 'F'.
