[R] Drawing a circle on an existing graph.

From: Allan Kamau <kamauallan_at_gmail.com>
Date: Sat, 12 Mar 2011 11:08:29 +0300

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.


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