[r] aggiunta delle etichette degli assi xey in ggplot2



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Question

Come cambio le etichette xey su questo grafico per favore?

library(Sleuth2)
library(ggplot2)
discharge<-ex1221new$Discharge
area<-ex1221new$Area
nitrogen<-ex1221new$NO3
p <- ggplot(ex1221new, aes(discharge, area), main="Point")
p + geom_point(aes(size= nitrogen)) + 
    scale_area() + 
    opts(title = expression("Weighted Scatterplot of Watershed Area vs. Discharge and Nitrogen Levels (PPM)"), 
         subtitle="n=41")



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