[R] plotting circles / piecharts with only one category

[Ross Ihaka]

Moritz Lennert wrote:
> 
> Hello,
> 
> For further use in a cartography program, I would like to create a bunch of
> eps files with circles in graduated gray shades (5 different shades). Up
> to now I've been using 'piechart' for this, but since I only have one
> single category I get a central line in the circles which is not very
> aesthetic. Is there a way to keep piechart from drawing this central line,
> or is there a function that would allow me to draw simple circles in
> different gray shades ?

The function you want is called "symbols".  E.g.

x <- runif(10)
y <- runif(10)
r <- (1+runif(10))/2
plot(x, y, type="n", xlim=c(0,1), ylim=c(0,1), axes=F, ann=F)
symbols(x,y,circles=r,inches=.5,bg=gray((1:10)/10))

Ross
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