[Haskell-cafe] How to improve its performance ?
ozgurakgun at gmail.com
Thu Mar 18 07:44:32 EDT 2010
As Daniel pointed out earlier, this may be of a little bit of help:
On 18 March 2010 04:03, Alexander Solla <ajs at 2piix.com> wrote:
> On Mar 17, 2010, at 8:33 PM, zaxis wrote:
>> `allPairs list = [(x,y) | x <- list, y <- list] ` is not what
>> does !
>>> let allPairs list = [(x,y) | x <- list, y <- list]
>>> allPairs [1,2,3]
> Yeah, I know that. I said so specifically. combination computes the power
> set of a list. You said your goal was to compute a set of "two groups".
> You don't need the power set in order to compute a set of pairs. Moreover,
> computing the power set is a slow operation. Indeed, it is the source of
> your slowness.
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