Reading "Modern Applied Statististics with S" and trying the corresponding examples both in the book and in ../lib/R/library/MASS/script, I'm now trying chapter 4 plotting bars with the following code on a linux box with R 1.8.1: ---------------------- library(MASS) library(lattice) options(echo=T, width=65, digits=5) lung.deaths <- aggregate(ts.union(mdeaths, fdeaths), 1) barplot(t(lung.deaths), names = dimnames(lung.deaths)[[1]], main = "UK deaths from lung disease") if(interactive()) legend(locator(1), c("Males", "Females"), fill = c(2, 3)) -----------------------
The legend doesn't look correct with respect to the picture at page 72 of the book for two reasons:
1) The legend has a transparent background while in the book is "correctly" opaque (and, above all, this is the background I expect!);
Set the argument bg = "white"
2) One of the two variables is represented in the legend with a different colour from the same variable in the bars plot (green instead of yellow)
Use heat.colors() (barplot() uses it to generate the colors).
How could I set 1 and 2 right?
legend(locator(1), c("Males", "Females"), fill = heat.colors(2), bg = "white")
That points us to a documentation bug in ?legend, whioch tells us in its Arguments section:
bg the background color for the legend box. (Note that this is only used if bty = "n".)
Obviously, it is used if bty = "o", but *not* if "n".
Uwe Ligges
Thanks for your help
Vittorio
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