Question

I have a big dataframe with columns such as:

ID, time, OS, IP

Each row of that dataframe corresponds to one entry. Within that dataframe for some IDs several entries (rows) exist. I would like to get rid of those multiple rows (obviously the other attributes will differ for the same ID). Or put different: I only want one single entry (row) for each ID.

When I use unique on the ID column, I only receive the levels (or each unique ID), but I want to keep the other attributes as well.
I have tried to use apply(x,2,unique(data$ID)), but this does not work either.

Answer 1

subset(data,!duplicated(data$ID))

Should do the trick