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A-M baby

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Ingy döt Net 2013-04-10 21:29:02 -07:00
parent 764da6cbbb
commit db842d013d
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Task/Forward-difference/Haskell/forward-difference.hs Normal file
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forwardDifference xs = zipWith (-) (tail xs) xs
nthForwardDifference xs n = iterate forwardDifference xs !! n
> take 10 (iterate forwardDifference [90, 47, 58, 29, 22, 32, 55, 5, 55, 73])
[[90,47,58,29,22,32,55,5,55,73],
[-43,11,-29,-7,10,23,-50,50,18],
[54,-40,22,17,13,-73,100,-32],
[-94,62,-5,-4,-86,173,-132],
[156,-67,1,-82,259,-305],
[-223,68,-83,341,-564],
[291,-151,424,-905],
[-442,575,-1329],
[1017,-1904],
[-2921]]