def idd_sfrmi(l, m):
return _id.idd_sfrmi(l, m)<EOL>
Initialize data for :func:`idd_sfrm`.

:param l:
    Length of output transformed vector.
:type l: int
:param m:
    Length of the 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:`idd_sfrm`.
:rtype: :class:`numpy.ndarray`