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The R internal function angle is used to draw ellipses around points in graphical displays.
angle
This function is used in two other functions that are caellipse and nscaellipse.
caellipse
nscaellipse
Macdonald PDM 2002 Drawing an ellipse in Splus or R. Available at www.math.mcmaster.ca/peter/s4m03/s4m03_0102/ellipse.html (accessed August 18, 2016).