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as200
2009 May 14
4
Duplicates and duplicated
Hi everybody.
I want to identify not only duplicate number but also the original number
that has been duplicated.
Example:
x=c(1,2,3,4,4,5,6,7,8,9)
y=duplicated(x)
rbind(x,y)
gives:
[,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10]
x 1 2 3 4 4 5 6 7 8 9
y 0 0 0 0 1 0 0 0 0 0
i.e. the second 4 [,5] is a duplicate.
What I want is