group_data {dplyr}

R Documentation

Grouping metadata

Description

• group_data() returns a data frame that defines the grouping structure. The columns give the values of the grouping variables. The last column, always called .rows, is a list of integer vectors that gives the location of the rows in each group. You can retrieve just the grouping data with group_keys(), and just the locations with group_rows().

• group_indices() returns an integer vector the same length as .data that gives the group that each row belongs to (cf. group_rows() which returns the rows which each group contains). group_indices() with no argument is deprecated, superseded by cur_group_id().

• group_vars() gives names of grouping variables as character vector; groups() gives the names as a list of symbols.

• group_size() gives the size of each group, and n_groups() gives the total number of groups.

See context for equivalent functions that return values for the current group.

Usage

group_data(.data)

group_keys(.tbl, ...)

group_rows(.data)

group_indices(.data, ...)

group_vars(x)

groups(x)

group_size(x)

n_groups(x)

Arguments

.data, .tbl, x	A data frame or extension (like a tibble or grouped tibble).
...	Use of ... is now deprecated; please use group_by() first instead.

Examples

Run examples

df <- tibble(x = c(1,1,2,2))
group_vars(df)
group_rows(df)
group_data(df)
group_indices(df)

gf <- group_by(df, x)
group_vars(gf)
group_rows(gf)
group_data(gf)
group_indices(gf)

---