[R] Drawing a circle on an existing graph.

[Gabor Grothendieck]

On Sat, Mar 12, 2011 at 3:08 AM, Allan Kamau <kamauallan at gmail.com> wrote:
> I would like to draw a circle on a graph I am plotting in R and use
> the current plot's coordinate system.
> The most basic functionality I am looking for is the ability to plot a
> circle on an already existing graph by simply providing the xy
> coordinates for it's centre and the radius.
>
> I am also looking for a way to obtain x,y values of a point (of a
> circle) by specifying only the origin x,y the angle and radius.
>
> Please point me so such a library and perhaps some simple one line code.
>

There is draw.circle in the plotrix package.

Also cex can create varying sizes of circles:
plot(1:10, cex = 1:10)


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