In R, how can I take a subset of columns of a data frame and then eliminate duplicate rows?
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02-10-2019 - |
Pergunta
Imagine I have a data frame with data like this:
A | B | C
---+---+---
1 | 2 | a
1 | 2 | b
5 | 5 | a
5 | 5 | b
I want to take only columns A and B, and I want to remove any rows that have become duplicates as a result of eliminating all other columns (that is, column C). So my desied result for the table above would be:
A | B
---+---
1 | 2
5 | 5
What is the best way to do this?
Solução
If your data.frame is called df, then do this:
unique(df[, c("A", "B")])
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