[erlang-questions] specs for fixed length lists

Erik Søe Sørensen <>
Tue Jul 10 11:00:29 CEST 2012


It can optimize setelement used in a loop? I'd be surprised, although
pleasantly so.
(I didn't even know it could handle non-fixed indexes, but then I am not
generally very familiar with it.)
One more thing to research...
Den 10/07/2012 10.10 skrev "Anthony Ramine" <>:

> I wouldn't be so sure about that, you need to check whether the
> destructive updates pass (dsetel) does its magic here.
>
> --
> Anthony Ramine
>
> Le 10 juil. 2012 à 01:50, Erik Søe Sørensen a écrit :
>
> > Using setelement is a bad idea, at least unless the tuples are very
> small: the cost in time and allocation is n^2.
> > A better scaling approach is to use tuple_to_list + map + list_to_tuple;
> that should be linear, and my guess is that it'd be faster even for small
> tuple sizes.
> > (For the actual n=4 case, I don't know which is better; must  measure...)
> > /Erik
>
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