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

[chuck.01]

length(unique(a))



Hard Core wrote
> Hello,
> Suppose that i have a dataframe
> a <- read.dta("banca_impresa.dta")
> 
> i have a column with 17900 obs like 
> 
> 1
> 2
> 3
> 1
> 6
> 7
> 8
> 3
> 4
> 4
> 
> and i want to know the number of the different values so in this case it
> would be 7 
> How can i do? 
> Thank you





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