[R] plotting pie-charts into a coordinate system

[hadley wickham]

On Sun, May 4, 2008 at 2:30 PM, Georg Ehret <georgehret at gmail.com> wrote:
> Dear R user group,
>      I wish to plot small pie-charts to specific coordinates in a e.g.
>  scatter-plot:
>
>  E.g.:
>  > plot(rnorm(100),rnorm(100))
>  > points(1,1,col="red",cex=4)
>  -> I wish to put pie(c(2,3)) at the position of the red circle...
>
>  How can I do this efficiently?

For some discussion of the disadvantages of this type of display, and
some suggestions for alternatives, you might like to read
http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=00018S.

Another interesting page is
http://www.math.yorku.ca/SCS/Gallery/minard/minard.pdf, which
describes the first use of this technique, by Minard.

Hadley


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