[R] Levels of a vector for a contour plot

Art Salwin salwin at mitretek.org
Wed Apr 5 22:40:55 CEST 2000

Is there something more elegant than


to get the levels found in vector x?  xlevels will be used
to generate
a contour plot as in

where zvals<-tapply(z,list(x,y),mean)

Art Salwin
salwin at mitretek.org
(202) 863-2985
(202) 863-2988 (fax)
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