group_by_all {dplyr}R Documentation

Group by a selection of variables

Description

These scoped variants of group_by() group a data frame by a selection of variables. Like group_by(), they have optional mutate semantics.

Usage

group_by_all(.tbl, .funs = list(), ..., .add = FALSE,
  .drop = group_by_drop_default(.tbl))

group_by_at(.tbl, .vars, .funs = list(), ..., .add = FALSE,
  .drop = group_by_drop_default(.tbl))

group_by_if(.tbl, .predicate, .funs = list(), ..., .add = FALSE,
  .drop = group_by_drop_default(.tbl))

Arguments

.tbl

A tbl object.

.funs

A function fun, a quosure style lambda ~ fun(.) or a list of either form.

...

Additional arguments for the function calls in .funs. These are evaluated only once, with tidy dots support.

.add

See group_by()

.drop

When .drop = TRUE, empty groups are dropped. See group_by_drop_default() for what the default value is for this argument.

.vars

A list of columns generated by vars(), a character vector of column names, a numeric vector of column positions, or NULL.

.predicate

A predicate function to be applied to the columns or a logical vector. The variables for which .predicate is or returns TRUE are selected. This argument is passed to rlang::as_function() and thus supports quosure-style lambda functions and strings representing function names.

Grouping variables

Existing grouping variables are maintained, even if not included in the selection.

See Also

Other grouping functions: group_by, group_indices, group_keys, group_map, group_nest, group_rows, group_size, group_trim, groups

Examples

# Group a data frame by all variables:
group_by_all(mtcars)

# Group by variables selected with a predicate:
group_by_if(iris, is.factor)

# Group by variables selected by name:
group_by_at(mtcars, vars(vs, am))

# Like group_by(), the scoped variants have optional mutate
# semantics. This provide a shortcut for group_by() + mutate():
d <- tibble(x=c(1,1,2,2), y=c(1,2,1,2))
group_by_all(d, as.factor)
group_by_if(iris, is.factor, as.character)

[Package dplyr version 0.8.5 Index]