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A proposal for appending totals in summarise #316

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joselao opened this issue Oct 16, 2020 · 1 comment

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enhancement question

joselao commented Oct 16, 2020 •

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A proposal, add bind_rows(), or similar to the tools to get totals easily. i.e.:

mtcars %>%
    # convert cyl column as.character
    mutate_at("cyl",as.character) %>%
    # append a copy of the original mtcars with cyl column = 'TOTAL'
    bind_rows(mutate(mtcars, cyl="total")) %>%
    group_by(cyl) %>% summarise(mpg=mean(mpg)) %>% as.data.frame

To get the final row "total":

    cyl      mpg
1     4 26.66364
2     6 19.74286
3     8 15.10000
4 total 20.09062

The text was updated successfully, but these errors were encountered:

Collaborator

xiaodaigh commented Nov 5, 2020

Yeah. One has to think about how to do this in disk.frame you can just group by, summarise, collect and then and then apply the same.

bind_rows is possible with rbindlist.disk.frame

Perhaps bind_rows needs to be added.

xiaodaigh added enhancement question labels

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