circles: Add circles to plot
Description
Base R has a function for plotting circles called "symbols". Unfortunately, the size of the circles is inconsistent across devices. This function plots circles whose radius is specified in used coordinates.
Usage
circles(x, y, radius, bg = NULL, fg = "white", ...)
Arguments
radius
radius (in user coordinates)
...
passed to polygon, e.g. lwd
Value
none, used for side effect