[R] help with the unique function

[ravi]

Hi,
Thanks for the different suggestions - Jorge, Erik, Marc, Ted and Phil. Thanks to you, I have learnt quite a few, for me new, tricks and methods.
Thanks,
Ravi
----- Original Message ----
From: Phil Spector <spector at stat.Berkeley.EDU>
To: ravi <rv15i at yahoo.se>
Cc: r-help at r-project.org
Sent: Wednesday, 7 May, 2008 7:14:28 PM
Subject: Re: [R] help with the unique function

Another way to produce the data frame is

subset(as.data.frame(table(x)),Freq>0)

                                        - Phil Spector
                    Statistical Computing Facility
                    Department of Statistics
                    UC Berkeley
                    spector at stat.berkeley.edu


On Wed, 7 May 2008, 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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