[R] multiple groups with different colors in boxplot

ONKELINX, Thierry Thierry.ONKELINX at inbo.be
Tue Oct 13 11:47:58 CEST 2009

Here is a solution using ggplot2

n <- 1000
dataset <- data.frame(A = rep(1:6, n), B = rep(gl(3, 2), n))
dataset$C <- with(dataset, rnorm(n) * as.numeric(B) + A)
dataset$A <- factor(dataset$A)
#with default colours
ggplot(dataset, aes(x = A, y = C, colour = B)) + geom_boxplot()
#with custom colours
ggplot(dataset, aes(x = A, y = C, colour = B)) + geom_boxplot() +
scale_colour_manual(breaks = c("1", "2", "3"), values = c("red",
"green", "blue"))



ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature
and Forest
Cel biometrie, methodologie en kwaliteitszorg / Section biometrics,
methodology and quality assurance
Gaverstraat 4
9500 Geraardsbergen
tel. + 32 54/436 185
Thierry.Onkelinx at inbo.be

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to
say what the experiment died of.
~ Sir Ronald Aylmer Fisher

The plural of anecdote is not data.
~ Roger Brinner

The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens kennyPA
Verzonden: dinsdag 13 oktober 2009 7:12
Aan: r-help at r-project.org
Onderwerp: [R] multiple groups with different colors in boxplot

Can anybody help me on how to boxplot multiple groups with different
Say, I have 3 groups of data, each group with 2 boxes, and I'd like to
have the following layout in the boxplot:

red, red, green, green, blue, blue

thanks in advance. 
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