[R] transparent colors

Uwe Ligges ligges at statistik.uni-dortmund.de
Wed Oct 10 18:54:42 CEST 2007

See ?rgb and its alpha argument, for example.

Uwe Ligges

Markus Loecher wrote:
> Dear R graphics experts,
> Do you know of any way of plotting semi-transparent points in R ?
> I face this problem any time I want to e.g. plot thousands of points  
> that belong to two or three classes which I color code.
> With the default opaque colors, the plotting order matters and  
> basically the points I plot last completely dominate the picture. I  
> would much rather have the overlaying points mix in color..
> Thanks a lot,
> Markus
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