# Re: [R] Obtaining replicates numbers of a vector

From: Moshe Olshansky <m_olshansky_at_yahoo.com>
Date: Thu, 20 Dec 2007 04:58:52 -0800 (PST)

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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> and provide commented, minimal, self-contained,
> reproducible code.
>

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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Thu 20 Dec 2007 - 14:22:31 GMT

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