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Add cumsum#251

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Illviljan wants to merge 69 commits intoxarray-contrib:mainfrom
Illviljan:cumsum
Closed

Add cumsum#251
Illviljan wants to merge 69 commits intoxarray-contrib:mainfrom
Illviljan:cumsum

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@Illviljan
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@dcherian dcherian left a comment

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Exciting to see!

a = np.array([3, 4, 1, 3, 9, 9, 6, 7, 7, 0, 8, 2, 1, 8, 9, 8])
b = npg.aggregate(group_idx, a, func="cumsum")

bb = groupby_reduce(a, group_idx, func="cumsum", engine="numpy")[0]
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Let's add a groupby_accumulate(a, group_idx, func="sum", engine="numpy) that only returns a single array.

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I'm not a fan that groupby_reduce and groupby_accumulate wont have the same typing though.

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@dcherian dcherian Jul 7, 2023

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They are very different operations so they have to be. For e.g. method="map-reduce" isn't applicable. fill_value doesn't make any sense I don't think (an initial value does)

Co-authored-by: Deepak Cherian <dcherian@users.noreply.github.com>
@dcherian dcherian mentioned this pull request Jun 28, 2024
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