fct_drop_levels: Drop unused levels
In dpavlic/EPmisc: Misc programming convenience, model and output functions

Description Usage Arguments See Also Examples

Wrapper around forcats drop_levels which will not modify or drop non-level attributes. Compared to 'base::droplevels()' does not drop 'NA' levels that have values.

1	fct_drop_levels(f, only)

`f`	A factor
`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.

fct_drop

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

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