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I would avoid the recursive Above() approach, of the simple fact that it doesn't work for data sets with 100+ values.
Instead, I think that your first approach with the Aggr() can be made to work also when you have a date as dimension: Add a sorted dimension (date,Numeric) in the Aggr() function, and use RangeSum(Above()) on the array of values that Aggr() creates.
pow($(vLambda),Count(distinct total [date])-RowNo()),
> By the way, the Anycharts extensions are very nice.
I think we have a solution that will work for your task. Let's discuss it. please ping me at firstname.lastname@example.org