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...e to have one colors per stack, so 4 different colors total. The problem is that R is only given me 2 colors (the same two for the bottom stack and the same two for the top stack). Any idea how I can do to have 4 colors? (without using ggplot2 preferably) Here is my code > w <- matrix(table(cutMF12G3),2,2) > w [,1] [,2] [1,] 8 13 [2,] 8 8 > barplot(w, main="2012", col=c("red", "green", "blue", "pink")) Thanks in advance for your help. François [[alternative HTML version deleted]]