plotting grouped bar charts in R

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Your problem seem to come down to wrong data formatting. You need to make a matrix with the right row names structure to create plot that you want with base graphics. Here is your solution:

#your data...
d <- data.frame(row.names=c("1-2","2-3","3-4"), abc = c(10,80, 30), 
                def = c(15, 95, 55), ghi = c(20, 10, 80))
#but you make a matrix out of it to create bar chart
d <- do.call(rbind, d)
#...and you are sorted
barplot(d, beside = TRUE, ylim=c(0,100), legend.text = rownames(d), 
        args.legend = list(x = "topleft", bty="n"))

enter image description here

However, I sometimes like to use lattice for this kind of task. This time you don’t even have to make matrix, you just keep your data.frame in original format:

d <- data.frame(column1=rep(c("1-2","2-3","3-4"), each=3), 
                column2=rep(c("abc", "def", "ghi"), 3), 
                column3=c(10, 15, 20, 80, 95, 10, 30, 55, 80))
require(lattice)
barchart(column3 ~ column1, groups=column2, d, auto.key = list(columns = 3))

enter image description here

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