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.

Thanks,

Mark

        

 


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