Thank you for the many replies on this issue. I turns out qplot is not
suited to multiple annotations, so the best suggestions were to use
ggplot. The following worked for making an annotated stacked bar plot:
ggplot(algaedata) +
geom_bar(aes(x = year, y = cellsperml, colour = DIV, group = DIV)) +
geom_text(data = labelstouse, aes(x = x, y = y, label = numb))
Dennis Murphy additionally suggested using a combined line and point
plot by using the following instead:
geom_point(aes(x = year, y = cellsperml, colour = DIV, group = DIV)) +
geom_line(aes(x = year, y = cellsperml, colour = DIV, group = DIV))
All the best - Euan.
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