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I would like to plot this data frame. I have searched for a similar example and I couldn't find an exact match.
x <- data.frame(a=c(1:4), b=c(5:8), c=c(9:12), d=c(13:16)) row.names(x) <- c("w","x","y","z")
I want one barplot for the whole data frame, so each tick on the x-axis (w,x,y,z) will have four values (a,b,c,d).