Refactor whole data frame

Question

I have a data frame that I have read from disk and then applied a filter:

df <- df[ df$x > 10, ]

Question: How can I refactor all factors in the data frame now that several rows have been removed?

Check out `?droplevels`. Also, your lapply could be slightly simplified to: `df[] <- lapply(df, function (x) if (is.factor(x)) factor(x) else x)` — talat, Dec 04 '14 at 14:19
@beginneR thanks - if you post your response as an answer, I can +1 it! — Chris Snow, Dec 04 '14 at 14:24

score 4 · Accepted Answer · answered Dec 04 '14 at 14:18

4

The following worked for me:

df <- as.data.frame(lapply(df, function (x) if (is.factor(x)) factor(x) else x))

answered Dec 04 '14 at 14:18

Chris Snow

1 Answers1