Data manipulation in a data.frame

Also,
rownames(which(t(!!A[,-1]),arr.ind=TRUE))
A.K.

Hi,
May be this helps:

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

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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