R -- plotrix -- multhist() -- How to change the bin labels?

Question

I want to change the bin labels when using the multhist-function from the plotrix package. By bin labels, I mean the labels under each set of columns in the histograms.

Thanks.

Answer 1

The trick is to provide names to your breaks intervals, just as you would with the names.arg argument in barplot:

# install.packages("plotrix")
library(plotrix)

set.seed(1)
l <- list(rnorm(50),rnorm(50,sd=2),rnorm(50,mean=3))
breaks <- pretty(unlist(l))
levs <- levels(cut(unlist(l), breaks=breaks))
multhist(l, breaks=breaks, names.arg = levs)