Drop unused levels from a data frame in R

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Consider the following dataframe

set.seed(123)
x <- data.frame(let = sample(letters[1:6], 100, replace = T), 
                num = sample(1:10, 100, replace = T))
y <- subset(x, let != 'a')

So, how can I drop unused levels i.e. those levels that are not used in the data frame?

Jun 14, 2018 in Data Analytics by darklord
• 6,140 points
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1 answer to this question.

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0 votes

You can use this command droplevels()

y <- droplevels(y)
answered Jun 14, 2018 by DataKing99
• 8,100 points

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