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[ENH] nth function #3403

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[ENH] nth function #3403

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samukweku
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@samukweku samukweku commented Jan 3, 2023 •
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Implement dt.nth(cols, n) function to return the nth row (also per group) for the specified columns. If n goes out of bounds, NA-row is returned.

Closes #3128

@samukweku samukweku self-assigned this Jan 3, 2023
@samukweku samukweku mentioned this pull request Jan 3, 2023
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not sure how median is related to nth - triggering an Address boundary error

@oleksiyskononenko
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@samukweku let's separate first() and last() re-factoring from the new nth() feature. Also, could you please restore skipna parameter, so that I help you to make it work (got time for that)?

@samukweku samukweku changed the title [ENH] nth function; Refactor first() and last() reducers to use FExpr [ENH] nth function Jan 3, 2023
@samukweku samukweku added the new feature Feature requests for new functionality label Jan 3, 2023
@samukweku samukweku closed this Jan 3, 2023
@samukweku samukweku deleted the samukweku/nth_first_last branch January 3, 2023 20:24
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@oleksiyskononenko oleksiyskononenko Awaiting requested review from oleksiyskononenko

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@samukweku samukweku

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nth function/method for groupby
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@samukweku @oleksiyskononenko