[Haskell-cafe] How to incrementally update list

[KC]

Why do you want to incrementally update this list a lot of times?

The question would affect the answer you get; i.e. some context
(non-monadically speaking). :D


On Wed, Nov 28, 2012 at 3:43 AM, Branimir Maksimovic <bmaxa at hotmail.com> wrote:
> Problem is following short program:
> list = [1,2,3,4,5]
>
> advance l = map (\x -> x+1) l
>
> run 0 s = s
> run n s = run (n-1) $ advance s
>
> main = do
>         let s =  run 50000000 list
>         putStrLn $ show s
>
> I want to incrementally update list lot of times, but don't know
> how to do this.
> Since Haskell does not have loops I have to use recursion,
> but problem is that recursive calls keep previous/state parameter
> leading to excessive stack.and memory usage.
> I don't know how to tell Haskell not to keep previous
> state rather to release so memory consumption becomes
> managable.
>
> Is there some solution to this problem as I think it is rather
> common?
>
>
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-- 
--
Regards,
KC