Re: [R] help with the unique function

From: Erik Iverson <iverson_at_biostat.wisc.edu>
Date: Wed, 07 May 2008 11:31:23 -0500

ravi -

This may get you started

count.reps <- function(df) {

   hash <- do.call("paste", c(df, sep = "\r"))    cbind(unique(df), Freq = unclass(table(hash))) }

test <- data.frame(a = rep(1:10, 2), b = rep(1:10, 2)) count.reps(test)

Best,
Erik Iverson

ravi wrote:
> Hi,
> The unique function is easy to understand and use. Beyond that, I want to get also the frequency of repetition of each individual row in a data frame
> Let me explain with an example :
> x<-data.frame(a=c(1,2,3,1,2),b=c(2,3,4,2,3),c=c(10,20,30,10,20))
> xu<-unique(x)
> We have,
>> x
> a b c
> 1 1 2 10
> 2 2 3 20
> 3 3 4 30
> 4 1 2 10
> 5 2 3 20
>> xu
> a b c
> 1 1 2 10
> 2 2 3 20
> 3 3 4 30
>
> I want to get the following data frame :
> a b c Freq
> 1 1 2 10 2
> 2 2 3 20 2
> 3 3 4 30 1
> That is, in addition to the unique rows, I want to get the frequency of repetion of each individual row.
> I will appreciate all the help that I can get.
> Thank You,
> Ravi
>

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>



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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 Wed 07 May 2008 - 17:47:40 GMT

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