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Renumber group indices to be dense in 1..N.

Source: R/groups.R
compact_groups.Rd

Given a vector where element i is the group index for entry i (0 denotes "no group"), return a list with n_groups (the number of unique non-zero groups) and group_indices (the renumbered indices, using first-seen order). Zeros are preserved.

Usage

compact_groups(group_indices)

Arguments

group_indices

Integer vector (or coercible).

Value

list(n_groups = integer(1), group_indices = integer(N)).

See also

collect_group_members(), group_names()

Examples

compact_groups(c(5L, 10L, 5L, 0L, 10L))
#> $n_groups
#> [1] 2
#> 
#> $group_indices
#> [1] 1 2 1 0 2
#> 
# $n_groups = 2; $group_indices = c(1, 2, 1, 0, 2)