I agree with David about code that generates pictures for a wiki page in that, as I said earlier, it should remain very easily accessible to anyone who wants to edit these pages in the future and update the graphics. I do not think that anyone should have to know what _subversion_ is in order to fix a bug in my R code, or change some assumptions, or parameters, or colours.

My mindset when writing R scripts to make pictures is more like that when persuading Latex to do something unusual than writing `a proper program'.