fct_drop: Drop unused levels

In hadley/forcats: Tools for Working with Categorical Variables (Factors)

Drop unused levels

Description

Compared to base::droplevels(), does not drop NA levels that have values.

Usage

fct_drop(f, only = NULL)

Arguments

f	A factor (or character vector).
only	A character vector restricting the set of levels to be dropped. If supplied, only levels that have no entries and appear in this vector will be removed.

See Also

fct_expand() to add additional levels to a factor.

Examples

f <- factor(c("a", "b"), levels = c("a", "b", "c"))
f
fct_drop(f)

# Set only to restrict which levels to drop
fct_drop(f, only = "a")
fct_drop(f, only = "c")

hadley/forcats documentation built on Nov. 4, 2023, 2:24 a.m.