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Adaptive, left-aligned rolling max #5438

@gpierard

Description

@gpierard

I guess frollmax would be ideal here.

I would like to perform a rolling max using an (adaptive) non-equi join in data.table. Basing myself on this answer, I think I'm getting close, but not quite there.

For all rows of ex I need the max(value[row:end_window])

> ex
                    time    value end_window row
  1: 2022-03-14 08:20:02 13344.77        540   1
  2: 2022-03-14 08:20:02 13343.52        541   2
  3: 2022-03-14 08:20:03 13342.27        547   3
  4: 2022-03-14 08:20:04 13343.27        541   4
  5: 2022-03-14 08:20:04 13343.02        541   5

I tried calculating rollmax like so:

res <-ex[ex,.(value,row,end_window),on=.(row>=row,row<=end_window)][
  ,.(rollmax = max(value), end_window),by=.(row)]

but it isn't exactly what I expect. For row 1 it is correct because max(ex$value[1:540]) is indeed 13361.77.

res
   row  rollmax end_window
1:   1 13361.77        540
2:   1 13361.77        541
3:   1 13361.77        547
4:   1 13361.77        541

However, for row 596 this is not the case:

> res <- res[order(row)]
> res[596]
   row end_window  rollmax end_window row
1: 596        622 13327.42        622 596
> max(ex$value[596:622])
[1] 13328.67

Any idea?

Data:


> dput(ex)
structure(list(time = structure(c(1647246002.24923, 1647246002.79761, 
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related: https://stackoverflow.com/questions/73403038/r-data-table-rolling-max?noredirect=1#comment129630587_73403038

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