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How to extract unique elements from data.frame in R?

Can anyone suggest a way to extract unique elements from a data.frame?

I noticed unique

, but since it works on any rows or columns, it doesn't do what I'm looking for. I am behind unique cells from data.frame.

eg.

df<-data.frame(V1=c("Hello","fat","man"),V2=c("cat","fat","Hello"),V3=c("man","dog","black"))

Extracting unique items should give me c("Hello","fat","man","cat","dog","black")

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1 answer


A 'data.frame' can be thought of as a "list" with columns as "list" items having the same length. Using unlist

, we can convert it to vector

and then get the values unique

and convert to the 'character' class with as.character

.



as.character(unique(unlist(df)))
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