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Line 6: Based on [[j:Essays/FFT]], with some simplifications, sacrificing accuracy not visible here for clarity: <lang j>cube =: ($~ q:@#) :. , roots =: +@]^:(0>[) (_1^2%]) ^ i.@-: rou =: [: j./ 2 1 o./ o.@(% #)@i.@-:

Fast Fourier transform: Difference between revisions

Fast Fourier transform (view source)