ggplot2:如何使点与小提琴图分组? | 如何使点与小提琴图分组

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问题描述

我想绘制x轴为exon的小提琴图，但是我想对这些图进行分组.如果只是小提琴，这是可行的，但是当我出于某种原因添加抖动时，它没有响应正确的aes，而是自己绘制吗?这是一个可复制的代码，其中包含错误的屏幕快照.谢谢！

I would like to plot violin plots where x axis is exon however I want to group the plots. This works if its just violins however when I add in the jitters for some reason its not responding the correct aes and is plotting on its own? Here is a reproducible code with a screen shot of the error. thanks!

set.seed(1)
df <- data.frame(
  exons = c(rep("e1", 200), rep("e2", 200)),
  values = rnorm(400, 200, 40),
  group = c(
    rep("g1", 75), rep("g2", 75), rep("g3", 50),
    rep("g1", 75), rep("g2", 75), rep("g3", 50)
  )
)

ggplot(df, aes(y = values, x = exons, fill = group)) +
  geom_violin() +
  geom_jitter(shape = 16, position = position_jitter(0.07))

因此，如果该图有效，则应该在每个外显子的每个组内绘制点，但是这里显然不是.

so if the plot works the dots should had been plotted within each of the group for each exon, however here it is clearly not.

推荐答案

您可能同时需要position_dodge()和position_jitterdodge()

library(ggplot2)
ggplot(df, aes(y = values, x = exons, fill = group)) +
  geom_violin(position = position_dodge(width = 0.9)) +
  geom_point(position = position_jitterdodge(seed = 1, dodge.width = 0.9))

另一个值得一提的选项是 ggbeeswarm 包中的geom_quasirandom()函数

Another option worth mentioning is geom_quasirandom() function from the ggbeeswarm package

library(ggbeeswarm)
ggplot(df, aes(y = values, x = exons, fill = group)) +
  geom_violin(position = position_dodge(width = 0.9)) +
  geom_quasirandom(dodge.width = 0.9, varwidth = TRUE)

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