Grouping metadata
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argument is deprecated, superseded by cur_group_id().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.
group_data(.data) group_keys(.tbl, ...) group_rows(.data) group_indices(.data, ...) group_vars(x) groups(x) group_size(x) n_groups(x)
.data, .tbl, x |
A data frame or extension (like a tibble or grouped tibble). |
... |
Use of |
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)
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