[R] Obtaining replicates numbers of a vector

[Moshe Olshansky]

You could do:

> x <- c('A','B','A','C','C','B')
> x
[1] "A" "B" "A" "C" "C" "B"
> mapply(function(i) sum(x[1:i] == x[i]),1:length(x))
[1] 1 1 2 1 2 2
> 

--- Eric Lecoutre <ericlecoutre at gmail.com> wrote:

> Dear R-help,
> 
> I am trying to have a generic way to assess the
> replicates in a character
> vector.
> Say that I have the following vector:
> 
> x <- c('A','B','A','C','C','B')
> 
> I would like to obtain:
> 
> replicates <- c(1,1,2,1,2,2)
> 
> each number beeing the time we see the corresponding
> value in x.
> 
> Any clever and generic way to obtain that?
> 
> Eric
> 
> 
> 
> 
> -- 
> Eric Lecoutre
> Consultant - Business & Decision
> Business Intelligence & Customer Intelligence
> 
> 	[[alternative HTML version deleted]]
> 
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