Display values in piechart/barplot

Is it possible to automatically display the underlying values of a 
piechart/barplot in the graphic? If so, which package/function/argument do I 
need for it?
Thanks,
Volker

Using pie charts are not a particularly good way of displaying data,
even though the pie() function is available in R. See ?pie for more
information on this.

For barplots, the following provide two approaches:


# Place the bar values above the bars
# Note that I set 'ylim' to make room for 
# the text labels above the bars

vals <- 1:5
names(vals) <- LETTERS[1:5]
mp <- barplot(vals, ylim = c(0, 6))
text(mp, vals, labels = vals, pos = 3)



# Place the bar values below the x axis

vals <- 1:5
names(vals) <- LETTERS[1:5]
mp <- barplot(vals)
mtext(side = 1, at = mp, text = vals, line = 3)


Note that barplot() returns the bar midpoints, so you can use these
values for annotation placement.

See ?barplot, ?text and ?mtext for more information.

HTH,

Marc Schwartz

Is it possible to automatically display the underlying values of a 
piechart/barplot in the graphic? If so, which package/function/argument do I 
need for it?

floating.pie and pie.labels in the plotrix package.

Jim