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3d counterpart of Donoho's quadlength utilized by the 2d pair. Original matlab code Vicki Yang and Brani Vidakovic.
cubelength(x)
n length(x).
n
J least power of two greater than n.
J
3-d array; dim(n,n,n), n = 2^J (hopefully).
FWT3_PO, IWT3_PO.
FWT3_PO
IWT3_PO
cubelength(array(1:3, c(2,2,2)))
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