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.
group_rows()returns the rows which each group contains.
group_indices()returns an integer vector the same length as.datathat gives the group that each row belongs to.
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.
n_groups()gives the total number of groups.
Usage
group_data(.data)
group_rows(.data)
group_indices(.data)
group_vars(x)
groups(x)
group_size(x)
n_groups(x)See also
See context for equivalent functions that return values for the current group.
Examples
df <- data.frame(x = c(1,1,2,2))
group_vars(df)
#> character(0)
group_rows(df)
#> [[1]]
#> [1] 1 2 3 4
#>
group_data(df)
#> .rows
#> 1 1, 2, 3, 4
gf <- group_by(df, x)
group_vars(gf)
#> [1] "x"
group_rows(gf)
#> [[1]]
#> [1] 1 2
#>
#> [[2]]
#> [1] 3 4
#>
group_data(gf)
#> x .rows
#> 1 1 1, 2
#> 2 2 3, 4