thanks, guys. circles might be a good candidate for a graphics primitive in the next R version, if only because---unlike the solutions here---I believe that postscript/pdf have scaleable primitives---though I am no postscript expert. of course, if I knew what I was talking about, I would just write the function and submit it. the closest I have found was in http://wtonline.vitalnews.com/Pages/Tip0163.html
regards, /ivo
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