[Haskell-cafe] Re: Incremental array updates

Bulat Ziganshin bulat.ziganshin at gmail.com
Thu Feb 26 13:36:17 EST 2009

Hello Daniel,

Thursday, February 26, 2009, 9:27:10 PM, you wrote:

> It was about this:  I needed to generate "all possibilities" for some
> combinations and each of those had a numeric property, say from 1 to 
> 10000; I then had to count how many of the possibilities were of a given
> "category".  So I created this array, generated all combinations, and 
> incremented the matching slot each time.

it's histogram essentially? accumArray is doing so. internally, it's
the same loop using STArray, but accumArray provide you pure API for
such computations

Best regards,
 Bulat                            mailto:Bulat.Ziganshin at gmail.com

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