Dear R-helpers,
I have a data frame with 3 variables, each record is a unique combination of
the three variables. I would like to count the number of unique values of v3
in each v1, and save it as a new variable v4 in the same data frame.
e.g.
df1
[v1] [v2] [v3]
[1,] "a" "C" "1"
[2,] "b" "C" "2"
[3,] "c" "B" "3"
[4,] "a" "B" "3"
[5,] "b" "A" "2"
[6,] "c" "A" "1"
In this case, the 4th column would become (2, 1, 2, 2, 1, 2).
Could someone tell me how to do this?
regards,
Lijiang
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