idz_sfrm(l, n, w, x)
In contrast to idz_frm
, this routine works best when the length of the transformed vector is known a priori.
Length of transformed vector, satisfying :None:None:`l <= n`.
int
Greatest power-of-two integer satisfying :None:None:`n <= x.size` as obtained from idz_sfrmi
.
int
Initialization array constructed by idd_sfrmi
.
numpy.ndarray
Vector to be transformed.
numpy.ndarray
Transformed vector.
numpy.ndarray
Transform complex vector via a composition of Rokhlin's random transform, random subselection, and an FFT.
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