       (the given matrix X is updated).

  JOBY    CHARACTER*1
          Specifies whether or not the right transformations are
          accumulated, as follows:
          = 'N':  The right transformations are not accumulated;
          = 'U':  The right transformations are accumulated in Y
                  (the given matrix Y is updated).

  SORT    CHARACTER*1
          Specifies whether or not the diagonal elements of the
          generalized Schur form are reordered, as follows:
          = 'N':  The