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在ggplot2中添加x和y轴标签
如何更改此图上的x和y标签? 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")