[R] 'beside' option for boxplots

[Uwe Ligges]

Example:

boxplot(d1$b ~ d1$a, pars = list(boxwex = 0.15), at=c(1:3 - 0.1), xaxt="n")
boxplot(d2$b ~ d2$a, add=T, pars = list(boxwex = 0.15), at=c(1:3 + 0.1), 
xaxt="n")
axis(1, at=1:3)

Uwe

Malcolm Ryan wrote:
> Is there any way to get a boxplot of several data sets beside one 
> another on the same graph, as there is for barplot?
> 
> If I do:
> 
> d1 <- data.frame(a = c(rep(1:3, each = 3)), b = c(1:9))
> d2 <- data.frame(a = c(rep(1:3, each = 3)), b = c(9:1))
> boxplot(d1$b ~ d1$a)
> boxplot(d2$b ~ d2$a, add=T)
> 
> It will show the two datasets on the one graph, but the middle point 
> will overlap.
> 
> What I want is a layout more like:
> 
> barplot(t(matrix(c(d1$b, d2$b), ncol=2)), beside=T)
> 
> only showing the boxes from the plot above instead of bars.
> 
> Can this be done?
> 
> Malcolm
> 
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