Re: how do you write aggregate function

i wish that could work but need to keep track of the individual weights
as its a percentage of the total amount of the weight.

I would never have thought the performance of the Array would suck this
bad.

Martijn van Oosterhout wrote:
> On Sun, Mar 09, 2008 at 11:40:47AM -0500, Justin wrote:
>
>> I got the aggregate function for weighted average done. I finely left
>> alone for more than 10 minutes to actual get it written. It takes 2
>> value input Weight and the Value. it will sum the weighted entries to
>> create the constant then does the normal formula, but does not
>> percentage number but averaged number. A simple change on the return
>> line it can do percentages.
>>
>
> If you're looking for performance, ISTM the best option would be to
> simply accumulate the weights and value*weight as you go and do a
> division at the end. That seems likely to beat any implementation
> involving array_append.
>
> Have a nice day,
>