[R] How to extract rows from data frame based on unique variable groupings

[Wu Gong]

I hope this is what you want.

## Exclude replicated rows
(DF1 <- unique(DF))

## Sort the data
(DF2 <- DF1[order(DF1$V1, DF1$V2, DF1$V3, DF1$V4),])

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A R learner.
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