[erlang-questions] Human readable errors in lists module

Ulf Wiger <>
Sat Feb 14 09:40:51 CET 2009


Yes, I caught that after having posted. I thought I had
already commented on that, but perhaps it didn't go to the list?

Oh, well... I posted a suggestion on this a while ago:

http://erlang.org/pipermail/erlang-questions/2004-November/013637.html

BR,
Ulf W

2009/2/13 Zvi <>:
>
> I was talking about parallel-comprehensions aka zip-comprehensions, not
> parallelized comprehensions:
>
> http://en.wikipedia.org/wiki/List_comprehension#Parallel_list_comprehension
>
> Zvi
>
>
> Ulf Wiger (TN/EAB) wrote:
>>
>> Zvi skrev:
>>> I think instead of "fixing" lists:zipwith, it's better to add
>>> parallel list comprehensions, i.e.:
>>>
>>> lists:zipwith(F, Xs, Ys) = [F(X,Y) || X<-Xs ; Y<-Ys].
>>>
>>> Note ";" instead of ",".
>>
>>
>> This is actually more difficult than it seems
>> at first glance.
>>
>> I went through parallelization of lists:map/2
>> as an exercise in a recent presentation:
>>
>> http://ulf.wiger.net/weblog/wp-content/uploads/2009/01/damp09-erlang-multicore.pdf
>>
>> The things that need careful consideration are
>> side-effects and exceptions. It's not obvious how
>> a generic implementation should behave, as there is
>> a cost/safety tradeoff.
>>
>> BR,
>> Ulf W
>> _______________________________________________
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>> 
>> http://www.erlang.org/mailman/listinfo/erlang-questions
>>
>>
>
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