[Haskell-cafe] Need some help with an infinite list

[Ross Mellgren]

Here's a way using list comprehensions:

Prelude Data.List> take 1000 $ concat.concat $ [ [ replicate n c | c  
<- ['a'..'z'] ] | n <- [1..] ]
"abcdefghijklmnopqrstuvwxyzaabbccddeeffgghhiijjkkllmmnnooppqqrrssttuuvvw 
wxxyyzzaaabbbcccdddeeefffggghhhiiijjjkkklllmmmnnnooopppqqqrrrssstttuuuvvvwwwxxxyyyzzzaaaabbbbccccddddeeeeffffgggghhhhiiiijjjjkkkkllllmmmmnnnnooooppppqqqqrrrrssssttttuuuuvvvvwwwwxxxxyyyyzzzzaaaaabbbbbcccccdddddeeeeefffffggggghhhhhiiiiijjjjjkkkkklllllmmmmmnnnnnooooopppppqqqqqrrrrrssssstttttuuuuuvvvvvwwwwwxxxxxyyyyyzzzzzaaaaaabbbbbbccccccddddddeeeeeeffffffgggggghhhhhhiiiiiijjjjjjkkkkkkllllllmmmmmmnnnnnnooooooppppppqqqqqqrrrrrrssssssttttttuuuuuuvvvvvvwwwwwwxxxxxxyyyyyyzzzzzzaaaaaaabbbbbbbcccccccdddddddeeeeeeefffffffggggggghhhhhhhiiiiiiijjjjjjjkkkkkkklllllllmmmmmmmnnnnnnnooooooopppppppqqqqqqqrrrrrrrssssssstttttttuuuuuuuvvvvvvvwwwwwwwxxxxxxxyyyyyyyzzzzzzzaaaaaaaabbbbbbbbccccccccddddddddeeeeeeeeffffffffgggggggghhhhhhhhiiiiiiiijjjjjjjjkkkkkkkkllllllllmmmmmmmmnnnnnnnnooooooooppppppppqqqqqqqqrrrrrrrrssssssssttttttttuuuuuuuuvvvvvvvvwwwwwwwwxxxxxxxxyyyyyyyyzzzzzzzzaaaaaaaaabbbbbbbbbcccccccccdddddddddeeeeeeeeefffffffffgggggggggh"

-Ross

On Jun 16, 2009, at 8:39 PM, Daniel Peebles wrote:

> One (rather ugly) option is:
>
> tail . map (\y -> showIntAtBase 26 (\x -> chr (x + 96)) y "") $ [0..]
>
> but I'm sure there's a prettier one out there :)
>
> On Tue, Jun 16, 2009 at 8:28 PM, GüŸnther  
> Schmidt<gue.schmidt at web.de> wrote:
>> Hi guys,
>>
>> I'd like to generate an infinite list, like
>>
>> ["a", "b", "c" .. "z", "aa", "ab", "ac" .. "az", "ba", "bb",  
>> "bc" .. "bz",
>> "ca" ...]
>>
>> When I had set out to do this I thought, oh yeah no prob, in a  
>> heartbeat.
>>
>> Uhm.
>>
>> Help, pls!
>>
>> Günther
>>
>> PS: I know this should be a no-brainer, sry
>>
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