| custom.draw.circle | R Documentation | 
Given a center, radius and color, this function draws a circle.
custom.draw.circle(x, y, r, col)
| x | X coordinate of the center | 
| y | Y coordinate of the center | 
| r | Radius of the circle | 
| col | Color of the circle | 
This function does not return a value, it just draws a circle.
Michael Bedward
http://www.r-bloggers.com/circle-packing-with-r/
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