例1：绘制二D等高线图的代码中出现了..level..



例2：柱状图代码中出现..count..x <- sample(c('A','B','C','D'), size = 1000, replace= TRUE, prob = c(0.2,0.3,0.3,0.2))
y <- rnorm(1000) * 1000
df = data.frame(x= x, y = y)
ggplot(data = df, aes(x = factor(x), y = ..count..))+ geom_bar(stat = 'count')

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[size=13.3333px]两个例子中“..”删掉则会报错，请问它[size=13.3333px]表示什么意思呢？想[size=13.3333px]百度都不知道该用什么关键词搜索==