[R] Removing all duplicate row except by one

[m.marcinmichal]

Hi,
It's my problem, supppose that we have a data.frame:

t
  a b c
1 1 1 1
2 0 1 1
3 1 1 1
4 0 0 0
5 1 0 1
6 0 1 0
7 1 1 1
8 0 1 0

I need extract duplicat row i.e i nedd frame like this

  a b c
3 1 1 1
8 0 1 0

I try use subset(t, duplicated(t)) and t[duplicated(t), ] but this command
return

  a b c
3 1 1 1
7 1 1 1
8 0 1 0

Best

Marcin M.


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