A small modification of plot.acf (patch)
2008/5/28 Gabor Grothendieck <ggrothendieck at gmail.com>:
The changes seem reasonable to me but here is a workaround
just in case (using builtin BOD and letters as examples):
i <- 0
setHook("plot.new", function() title(letters[i <<- i+1]))
acf(BOD, main = "")
setHook("plot.new", NULL, "replace")
Thanks, this works in my case. Note however, that iterating through caption strings can be a little bit more tricky if acf plot is splitted into several pages. Andrey Paramonov