ggplot2: change background colour, depending on factor levels on a discrete x axis

[Ricardo Ramiro]

Dear all,

I have been trying to find a way in which I can partition the background of a plot into different sections depending on my factor levels.

I found this post: http://stackoverflow.com/questions/9968975/using-ggplot2-in-r-how-do-i-make-the-background-of-a-graph-different-colours-in

in which they manage to do what I want for a continuous x axis, though I have not been able to apply this to my discrete x. If anyone has an idea of how to do it, I would greatly appreciate to get to know it.

Thanks!!

[Ben Bond-Lamberty]

You should be able to use geom_rect, as that stackoverflow example
shows, but with a couple tweaks:

d <- data.frame(x=c("A","B","C"),y=c(1,2,3))

ggplot(d,aes(x,y)) +geom_blank() +
geom_rect(aes(xmin=as.numeric(x)-.5,xmax=as.numeric(x)+.5,ymin=-Inf,ymax=Inf,fill=x))
+ geom_bar(stat="identity")

Ben

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