[R] symbol size on a plot

[Philippe Hupé]

Hi,

I would like to get from a plot the size of the symbols plotted.
Imagine I have the following plot function :
plot(1:2,1:2, pch=15, cex=4)
I would like the get the values SIZE1 and SIZE2 so that if I plot the 
following rectangle :
rect(1.5,1.5, 1.5+SIZE1, 1.5+SIZE2) then the size of this square is 
exactely the same as the one of the symbols that have been plotted.

Thanks for any idea.
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Philippe Hupé
Institut Curie - Equipe Bioinformatique
26, rue d'Ulm - 75005 PARIS France
+33 (0)1 42 34 65 29

Philippe.Hupe at curie.fr <mailto:Philippe.Hupe at curie.fr>