[R] How to count the number of different elements in a column

[chuck.01]

My apologies.
I still do not understand the difference; good luck. 


Hard Core wrote
> 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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