#Cooley-Tukey {.,.({[\.2%fft\(;2%fft@-1?-1\?-2?:w;.,,{w\?}%[\]zip{{*}*}%]zip.{{+}*}%\{{-}*}%+}{;}if}:fft; [1 1 1 1 0 0 0 0]fft n*