summarise_dt: Summarise columns to single values
In hope-data-science/tidydt: Tidy Verbs for 'data.table'

Description Usage Arguments Value See Also Examples

Analogous function for summarise in dplyr.

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summarise_dt(data, ..., by = NULL)

summarize_dt(data, ..., by = NULL)

`data`	data.frame
`...`	List of variables or name-value pairs of summary/modifications functions.
`by`	unquoted name of grouping variable of list of unquoted names of grouping variables. For details see data.table

data.table

summarise

iris %>% summarise_dt(avg = mean(Sepal.Length))
iris %>% summarise_dt(avg = mean(Sepal.Length),by = Species)
mtcars %>% summarise_dt(avg = mean(hp),by = .(cyl,vs))

# the data.table way
mtcars %>% summarise_dt(cyl_n = .N, by = .(cyl, vs)) # `.`` is short for list