tidyft: count – R documentation

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count

Count observations by group

Analogous function for count and add_count in dplyr.

count(.data, ..., sort = FALSE, name = "n")

add_count(.data, ..., name = "n")

`.data`	data.table
`...`	variables to group by.
`sort`	logical. If TRUE result will be sorted in desending order by resulting variable.
`name`	character. Name of resulting variable. Default uses "n".

data.table

a = as.data.table(mtcars)
count(a,cyl)
count(a,cyl,sort = TRUE)
a

b = as.data.table(iris)
b %>% add_count(Species,name = "N")
b

Tidy Verbs for Fast Data Operations by Reference

v0.4.5

MIT + file LICENSE

Authors

Tian-Yuan Huang [aut, cre] (<https://orcid.org/0000-0002-3591-4203>)

Initial release