Consider flipping to a decrement loop for readability inside rolling windows

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
35/100
Issue type
Refactor
Clarity
Mostly clear
Activity status
Stale
Tech stack
r
Domain
performance

Research direction

Search the rolling-window implementation for the loop using j, k, and x[i-j], then read the surrounding logic to confirm the proposed decrement form matches the existing iteration. The work is done when the loop is clearer without changing rolling-window behavior; the issue names no file or test to start from.

Written by the indexing model from the issue text.

Description

froll internals
          Maybe more readable as `int j=k-1; j>=0; j--` and `x[i-j]` instead?

Originally posted by @MichaelChirico in https://github.com/Rdatatable/data.table/pull/5889#discussion_r1447128256

Dominant language
R
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Merged PRs (30d)
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