
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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