Hello,
You're wrong, unique doesn't count unique returns a vector without
repetitions.
unique(a) # includes 1 and 4
[1] 1 2 3 6 7 8 4
length(unique(a))
[1] 7
Hope this helps,
Rui Barradas
Em 26-11-2012 14:55, Hard Core escreveu:
this is wrong because with the command "unique" it counts the only values
that are unique ..
in my column, for instance, 1 and 4 are not unique so the formula doesn't
work in my case
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