, and the N/2-by-N/2 upper
          triangular part of the submatrix in the columns 2 to N/2+1
          of this array must contain the upper triangular part of the
          skew-symmetric matrix D.
          The entries on the diagonal and the first superdiagonal of
          this array need not be set, but are assumed to be zero.
          On exit, if COMPQ = 'C', the leading N/2-by-N/2 lower
          triangular part and the first superdiagonal contain the
          transpose of the upper quasi-triangu