Change several column into factor - R

Question

I have a data frame with 203 column. Some of them string and I want to convert them to factor.

like this :

data$var =  as.factor((data$var))

The problem is, there is 180 string column. Is there a way to do this with a loop or a sapply maybe ? Anything that can help me to not writing this code 180 times.

http://stackoverflow.com/questions/33180058/coerce-multiple-columns-to-factors-at-once — user2957945, Apr 26 '17 at 15:11

score -1 · Answer 1 · edited Apr 26 '17 at 21:36

-1

I had the same issue to convert into numeric.

The solution for me was to use the following:

data[] <- lapply(data, function(x) as.numeric(as.character(x)))

edited Apr 26 '17 at 21:36

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answered Apr 26 '17 at 15:15

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Change several column into factor - R

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