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do
Do anything
Description
![[Superseded]](../help/figures/lifecycle-superseded.svg)
do() is superseded as of dplyr 1.0.0, because its syntax never really
felt like it belong with the rest of dplyr. It's replaced by a combination
of summarise() (which can now produce multiple rows and multiple columns),
nest_by() (which creates a rowwise tibble of nested data),
and across() (which allows you to access the data for the "current" group).
Usage
do(.data, ...)
Arguments
.data |
a tbl |
... |
Expressions to apply to each group. If named, results will be
stored in a new column. If unnamed, should return a data frame. You can
use |
Examples
# do() with unnamed arguments becomes summarise()
# . becomes across()
by_cyl <- mtcars %>% group_by(cyl)
by_cyl %>% do(head(., 2))
# ->
by_cyl %>% summarise(head(across(), 2))
by_cyl %>% slice_head(n = 2)
# Can refer to variables directly
by_cyl %>% do(mean = mean(.$vs))
# ->
by_cyl %>% summarise(mean = mean(vs))
# do() with named arguments becomes nest_by() + mutate() & list()
models <- by_cyl %>% do(mod = lm(mpg ~ disp, data = .))
# ->
models <- mtcars %>%
nest_by(cyl) %>%
mutate(mod = list(lm(mpg ~ disp, data = data)))
models %>% summarise(rsq = summary(mod)$r.squared)
# use broom to turn models into data
models %>% do(data.frame(
var = names(coef(.$mod)),
coef(summary(.$mod)))
)
# ->
if (requireNamespace("broom")) {
models %>% summarise(broom::tidy(mod))
}