[Haskell-cafe] slow code

[Jason Dagit]

On Tue, Jun 16, 2009 at 6:47 PM, brian <briand at aracnet.com> wrote:

>
> On Jun 16, 2009, at 8:58 AM, Don Stewart wrote:
>
>  So I guess it's the show's, but I can't seem to find more efficient
>>> float output.
>>> FFI to sprintf ? yuch.
>>>
>>
>> Is your SMLNJ using lazy lists? :)
>>
>>
> strictly speaking : no.
>
>  Try hmatrix or uvector.
>>
>>
> uvector is _probably_ the long term answer even after I solve the double ->
> string problem.
>
> However, I would like to reiterate that it's the double -> string which is
> really the time/memory sink.  I verified this by printing a simple string
> based on the value (to make sure the value was evaluated) and it runs fast
> enough for me.


You might want to look at the source and see if you can find a faster way to
convert it:
http://haskell.org/ghc/docs/latest/html/libraries/base/src/GHC-Float.html#showFloat

Jason
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