Re: [R] getting the unique values and counts from a vector

From: Dimitris Rizopoulos <dimitris.rizopoulos_at_med.kuleuven.ac.be>
Date: Sat 21 May 2005 - 01:14:19 EST

you could use table(), i.e.,

x <- c(2, 1, 2, 1, 4, 2, 1, 4, 1, 1)
#######
tab <- table(x)
xu <- as.numeric(names(tab))
xn <- as.vector(tab)
xu; xn

I hope it helps.

Best,
Dimitris



Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium

Tel: +32/16/336899
Fax: +32/16/337015
Web: http://www.med.kuleuven.ac.be/biostat/
     http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm


> Hi all,
>>From a vector, I want to get the unique values and the counts of
>>these

> unique values in the vector. For example,
> x<-c(2 ,1 ,2, 1, 4 ,2 ,1, 4 ,1 ,1)
> xu<-unique(x)
> xn<-numeric(length(xu))
> for (i in 1:length(xu)) {xn[i]<-length(which(x==xu[i]))}
> There must be a very much simpler method of doing this. Can somebody
> direct me to the functions that I must read in order to do
> operations of
> these sort.
> Thanks,
> Ravi Vishnu
>
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Sat May 21 01:38:03 2005

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