cumsumTopN

Syntax

cumsumTopN(X, S, top, [ascending=true], [tiesMethod=’latest’])

Please see Cumulative Moving TopN Functions (cumTopN functions) for the parameters and windowing logic.

Details

After stably sorting S in the specified ascending order, the function calculates the sum of the first top elements of X in a cumulative window.

Return value: LONG or DOUBLE type.

Examples

$ X=1 2 3 10 100 4 3
$ S = 0.3 0.5 0.1 0.1 0.5 0.2 0.4
$ cumsumTopN(X, S, 6, 4)
[1,3,6,16,116,120,121]

$ X = matrix(1..10, 11..20)
$ S = matrix(2022.01.01 2022.02.03 2022.01.23 NULL 2021.12.29 2022.01.20 2022.01.23 2022.01.22 2022.01.24 2022.01.24, NULL 2022.02.03 2022.01.23 2022.04.06 NULL 2022.02.03 2022.02.03 2022.02.05 2022.02.08 2022.02.03)
$ cumsumTopN(X, S, 6, 4)

#0	#1
1
3	12
6	25
6	39
11	39
17	55
24	72
30	90
30	95
30	96

$ id=rand(10,10)
$ price=rand(100,10)
$ t=table(id, price)
$ select cumsumTopN(price, id, 6, 4) as result from t

result
32
130
145
223
283
292
344
364
406
333