c Schur form, that is, A(:,:,H) is upper quasi
          triangular and the other factors are upper triangular.
          On exit, if JOB = 'T' and INFO = 0, the leading
          N-by-N-by-K part of this array contains the factors of
          A as for the option JOB = 'S', but the product of the
          triangular factors corresponding to a 2-by-2 block in
          A(:,:,H) is diagonal.
          On exit, if JOB = 'E', then the leading N-by-N-by-K part
          of this array contains meaningless eleme