Trim grouping structure

Description

Drop unused levels of all factors that are used as grouping variables, then recalculates the grouping structure.

group_trim() is particularly useful after a filter() that is intended to select a subset of groups.

Usage

group_trim(.tbl, .drop = group_by_drop_default(.tbl))

Arguments

Details

Value

A grouped data frame

See Also

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

Examples

iris %>%
  group_by(Species) %>%
  filter(Species == "setosa", .preserve = TRUE) %>%
  group_trim()