[R-sig-Geo] plotting vector of direction magnitude

[Sam Veloz]

I have a file of points with x/y coordinates and columns for bearing and 
distance. I would like to make a plot where each point is depicted by an 
arrow and the direction the arrow points is based on the value of 
bearing and the length of the arrow is based on the value of distance. 
Any suggestions on how to do this would be greatly appreciated.
Thanks,
Sam

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Sam Veloz
Postdoctoral Researcher
Department of Environmental Science and Policy
University of California, Davis
sdveloz at ucdavis.edu