Have a look at http://www.stat.auckland.ac.nz/~paul/RGraphics/chapter3.html
Picture 3.26 Thomas Roth Rainer M Krug schrieb:
Hi while teaching R, the question came up if it would be possible to add a picture (saved on the HDD) to a graph (generated by plot()), which we could not answer. It might easily kill a clean graph, but: is there a way of doing this, even one should not do it? On a similar line of thought: is it possibe to define own symbols so that they can be used in the plot function with pch=? Rainer
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