[rules-users] Evaluation of the of rules with 'window:length' event windows

[Wolfgang Laun]

On 16/05/2012, Vincent LEGENDRE <vincent.legendre at eurodecision.com> wrote:
>>
>>   accumulate( Whatever(...), $count: count(1), ... )
>>   eval( $count == X )
>
> strange construction ...
> "$count: count(1)" is part of the pattern ? then automatically incremented
> in $count variable ?
> Does the accumulate still return a List or something else ?

If you want to have a list, you can have it in addition to count:
   accumulate( $w: Whatever(...) from window:length( 10 ),
                        $count: count(1), $list: collectList( $w ),... )
although that would be redundant. But if you'd just need the (for
instance) sum, it would be useful.
  accumulate( Whatever( $x:x, ... ) from window:length( 10 ),
                        $count: count(1), $sum: sum( $x ) )

Note that this is a *complete* CE, beginning with "accumulate".

-W

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