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Re: Challenge: Another Infinite Lazy List

by tmoertel (Chaplain)
on Mar 19, 2005 at 01:25 UTC ( #440841=note: print w/ replies, xml ) Need Help??

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  1. or download this
    r = foldr merge [] . map (\n -> map (*n) [1..])
    
  2. or download this
    merge []     ys = ys
    merge xs     [] = xs
    ...
        | x < y     = x : merge xs (y:ys)
        | y < x     = y : merge (x:xs) ys
        | otherwise = x : merge xs ys
    
  3. or download this
    > take 60 (r [2,3,5])
    [2,3,4,5,6,8,9,10,12,14,15,16,18,20,21,22,24,25,26,27,28,30,32,33,34,3
    +5,36,38,39,40,42,44,45,46,48,50,51,52,54,55,56,57,58,60,62,63,64,65,6
    +6,68,69,70,72,74,75,76,78,80,81,82]
    

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