[R] Plotting symbols and colors based upon data values

From: Mark Linderman <mark.linderman_at_gmail.com>
Date: Sat, 12 Mar 2011 19:57:29 -0500

I am new to R and am sure this is simple, but I been unable to find a solution.

I have 5 columns of data labeled "X", "Y", "A","B","C". I can easily xyplot(Y ~ X | A) but I want the colors of the symbols to be based upon the values of B and the shape of the symbols to be determined by C. There are approximately four distinct values of B and C (say "b1","b2","b3","b4" and "c1","c2","c3","c4", respectively)  

Either a solution or a pointer to a specific reference/example is greatly appreciated.



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