def idz_frmi(m):
return _id.idz_frmi(m)<EOL>
Initialize data for :func:`idz_frm`.

:param m:
    Length of vector to be transformed.
:type m: int

:return:
    Greatest power-of-two integer `n` satisfying `n <= m`.
:rtype: int
:return:
    Initialization array to be used by :func:`idz_frm`.
:rtype: :class:`numpy.ndarray`