group_trim: Trim grouping structure

In hadley/dplyr: A Grammar of Data Manipulation

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

.tbl	A grouped data frame
.drop	See group_by()

Value

A grouped data frame

See Also

Other grouping functions: group_by(), group_map(), group_nest(), group_split()

Examples

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

hadley/dplyr documentation built on Nov. 6, 2024, 4:48 p.m.