ggplot2:Stat ＝"Identity"的小提琴图. [英] ggplot2: Violin Plot with Stat="Identity"

问题描述

我正在尝试使用ggplot创建一个小提琴图，在该图中，小提琴的宽度不是由密度函数控制的，而是直接表示相关元素的数量.

I'm trying to use ggplot to create a violin plot where instead of the widths of the violins being controlled by a density function, they directly represent the count of relevant elements.

我认为可以通过设置geom_violin(stat="identity")来实现，但是R然后抱怨

I think this can be accomplished through setting geom_violin(stat="identity"), but R then complains

> ggplot(allData, aes(x = tool, y = length)) + geom_violin(stat="identity")
Warning: Ignoring unknown parameters: trim, scale
Error in eval(substitute(list(...)), `_data`, parent.frame()) : 
  object 'violinwidth' not found

尝试添加aes(violinwidth=0.2*count)，如此答案所建议的，给出

Trying to add aes(violinwidth=0.2*count), as this answer suggests, gives

> ggplot(allData, aes(x = tool, y = length)) + geom_violin(stat="identity", aes(violinwidth=0.2*count))
Warning: Ignoring unknown parameters: trim, scale
Warning: Ignoring unknown aesthetics: violinwidth
Error in FUN(X[[i]], ...) : object 'count' not found

虽然我可以将violinwidth设置为一个常数，但这会使小提琴只是矩形.我该如何解决?

And while I can set violinwidth to just a constant, this makes the violins just rectangles. How can I fix this?

推荐答案

当我使用一些示例数据运行此程序时，无论是否更改stat和violinwidth，它都会生成确定的图.您的count是allData中的一列吗?

When I run this with some sample data, it generates the plots ok with and without the changes to stat and violinwidth. Is your count a column in allData?

library(ggplot2)

dt <- data.frame(category = rep(letters[1:2], each = 10),
                 response = runif(20),
                 count = rpois(20, 5))

ggplot(dt, aes(x = category, y = response)) + geom_violin()

ggplot(dt, aes(x = category, y = response)) + 
  geom_violin(stat = "identity", aes(violinwidth = 0.1*count))

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