[R] How to align group based on the common values of two columns in r

[arun]

Hi,
You could also try:

dat1<-read.table(text="
 Feature    OS
    4              2
    4              1
    4              3
    1              2
    4              1
",sep="",header=TRUE)
 dat1$Group<- as.numeric(factor(Reduce(paste0,dat1)))
A.K.

----- Original Message -----
From: Tammy Ma <metal_licaling at live.com>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc: 
Sent: Tuesday, January 22, 2013 4:28 AM
Subject: [R] How to align group based on the common values of two columns in r


HI,

I met this problem:

I have the feature data frame:


   Feature     OS
     4              2
     4              1
     4              3
     1              2
     4              1


what I want to do is to autimatically create one more column called "group":

   Feature     OS      Group
     4              2         1
     4              1         2
     4              3         3
     1              2         4
     4              1         2



I don't want "Ifelse", because I have so many combination of feature and OS, I even can not account.  I just want to have sth to autimatically create group indicator based on the difference combination of feature and OS.

Thanks for your help.


Kind regards,
Tammy


                          
    [[alternative HTML version deleted]]

______________________________________________
R-help at r-project.org mailing list
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.