I think that what you need to do is
as.table(as.matrix(dff))
E.g.
melvin <- data.frame(x=c(3,1,3,2),y=c(3,3,4,5))
clyde <- as.table(as.matrix(melvin))
prop.table(clyde,1)
x y
A 0.5000000 0.5000000
B 0.2500000 0.7500000
C 0.4285714 0.5714286
D 0.2857143 0.7142857
HTH.
cheers,
Rolf Turner
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