R 如何让ggplot柱状图箱跟随箱线图中断

到目前为止，我有：

hist <- ggplot(Mydf, aes(x=Mydf$Avg.CPC))
breaks <- c(min(Mydf$Avg.CPC), median(Mydf$Avg.CPC), max(Mydf$Avg.CPC))
h <- hist + geom_bar(binwidth = 0.025, colour = "black", breaks = breaks)
print(h)

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hist这就是你要找的吗

df<-data.frame(a=rnorm(100))
hist <- ggplot(df, aes(x=a))
#breaks <- c(min(df$a), median(df$a), max(df$a))
breaks <-  quantile(df$a,0:4*0.25)
h <- hist + stat_bin(colour="black",breaks = breaks,position="dodge")
print(h)

d如果您让箱子跟随均匀分布的分位数，那么每个条的高度将相同。这个情节的意义是什么？