Drop levels

Drop unused levels of a factor

Usage

drop_levels(x, ...)

# S3 method for class 'data.frame'
drop_levels(x, ...)

# S3 method for class 'fact'
drop_levels(x, ...)

# S3 method for class 'factor'
drop_levels(x, ...)

Arguments

x

A factor or data.frame

...

Additional arguments passed to methods (not used)

See also

base::droplevels

Other factors: as_ordered(), char2fact(), fact(), fact2char(), fact_na()