[R] add information above bars of a barplot()

[Martin Batholdy]

hi,


I have a barplot with six clusters of four bars each.
Now I would like to add the exact value of each bar as a number above the bar.

I hoped to get some tips here.
I could simply add text at the different positions, but I don't understand how the margins on the x-axis are calculated
(how can I get / calculate the x-ticks of a barplot?).

Also I would like to code this flexible enough so that it still works when I have more bars in each cluster.



thanks for any suggestions!