[R] Data manipulation in a data.frame

[arun]

Hi,
May be this helps:

A$Variable <- rep(colnames(A[,-1]),nrow(A))[t(!!A[,-1])]
A.K.


On Thursday, February 20, 2014 5:55 PM, ioanna ioannou <ii54250 at msn.com> wrote:
Hello,





Assuming that I have a data frame 

A<-data.frame(A=c(10,100,1000,30,50,60,300),

              B=c(0,1,1,1,0,0,0),                        

              C=c(0,0,0,0,1,1,0),

              D=c(1,0,0,0,0,0,1))



What I would like is to introduce a new column Variable such that:



A<-data.frame(A=c(10,100,1000,30,50,60,300),

              B=c(0,1,1,1,0,0,0),                        

              C=c(0,0,0,0,1,1,0),

              D=c(1,0,0,0,0,0,1),

       Variable=c(D,B,B,B,C,C,D)) 



How can I do it?



Best 

IOanna


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