[R] Adding a legend to a symbol plot

From: <Jennifer.Morin_at_colorado.edu>
Date: Fri 03 Jun 2005 - 04:56:35 EST


I have created a symbol plot with circles that represent the mean temperature at lat/lon locations over the United States. The radius of the circle corresponds to the mean temperature. I would like to add a legend that identifies a range of temperatures (e.g. 0-10, 10-20, etc) with circles of the appropriate radii next to them. I've read the manual on how to add a legend, and I'm fine with adding one to the plot. However, I cannot get circles of different sizes to come up next to the ranges in my legend. All that is coming up are circles of all the same radius. In looking at the R manual, it appears that in order to get the right radius for the circles, I have to use the "pch" parameter in the "legend" command, but I'm unclear on how I should define this parameter. Can anyone help?

thanks,
Jennifer Morin



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