[R] circle / oval / semicircle ?

[Gabor Grothendieck]

Barry Rowlingson <B.Rowlingson <at> lancaster.ac.uk> writes:

:   The 'symbols' function can draw circles, as well as a few other things 
: - stars, squares, rectangles, boxplots and thermometers.

For circles, one can also use plot like this:

   plot(1:5,pch=19,cex=1:5,col=rainbow(5))

See balloonplot (the actual call to plot is in balloonplot.default) in
package gregmisc for another example of this technique.