[erlang-questions] Question on building a variable with multiple math operations

[Illo de' Illis]

On Jul 10, 2009, at 5:29 PM, Illo de' Illis wrote:

> On Jul 10, 2009, at 5:17 PM, Greg Perry wrote:
>
>> [...]
>> I have been experimenting with lists:fold1 but it seems that is  
>> expecting a simple list without the use of tuples.
>>
>> Any ideas on this one?
>
> Isn't it as simple as doing:
>
> lists:foldl(fun erlang:'+'/2, 0, [X*Y || {X,Y} <- N1]).

Or

lists:foldl(fun ({X,Y},A) -> (X*Y)+A end, 0, N1).

Ciao,
Illo.