'list' is poorly named, it produces a rotation by one of the input list (xs) iterate applies 'list' 0 times, 1 time, 2 times, 3 times, ..., producing an infinite list of all rotations of xs take (length xs) gets the first (length xs) rotations from the infinite list produced by iterate, this is the final list of rotations by 0,1, ... length xs -1 of the input list xs On Dec 20, 2004, at 9:15 AM, M.I.Azad1@Bradford.ac.uk wrote:
hi could somebody please explain how everything works in this function? and why is 'list' there? any help will be much apprecited Regards Imran all_rotations :: [a] -> [[a]] all_rotations xs = take (length xs) (iterate list xs) list xs = tail xs ++ [head xs]
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