mutate_dt {tidyfst}

Mutate columns in data.frame

Description

Adds or updates columns in data.frame.

Usage

mutate_dt(.data, ..., by)

transmute_dt(.data, ..., by)

Arguments

.data

data.frame

...

List of variables or name-value pairs of summary/modifications functions.

by

(Optional) Mutate by what group?

Value

data.table

See Also

mutate

Examples

iris %>% mutate_dt(one = 1,Sepal.Length = Sepal.Length + 1)
iris %>% transmute_dt(one = 1,Sepal.Length = Sepal.Length + 1)
# add group number with symbol `.GRP`
iris %>% mutate_dt(id = 1:.N,grp = .GRP,by = Species)