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

[arun]

Hi,

I am not sure about the logic behind creation of groups, especially, how do you want to assign the group number to a particular combination of Feature and OS.
One possible way would be:
 dat1$Group<-paste(dat1[,1],dat1[,2],sep="")
> dat1
#  Feature OS Group
#1       4  2    42
#2       4  1    41
#3       4  3    43
#4       1  2    12
#5       4  1    41
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


                          
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