更改ggplot2图例中中位数和平均值的颜色

问题描述

请忽略整个图表中的随机点 - 这只是一个可快速重现的示例来说明我的意思：

ggplot(data = iris,aes(x = Sepal.Length,y = Sepal.Width,fill = Species)) + 
  geom_violin(alpha = 0.5) +
  stat_summary(aes(shape="mean",group=1),fun = "mean",size = 2,geom = "point",color = "black") +
  stat_summary(aes(shape = "median",group = 2),fun = "median",color = "red") +
  labs(x = "Sepal Length",y = "Sepal Width",shape = "Shape",colour = "Species") +
  theme_classic() 

我该怎么做：

a)。更改图例，使每个分类变量的框中间没有红点？ b)。更改“形状”图例的颜色，使“均值”为黑色，“中值”为红色？

我在 Google 上搜索了一个多小时，但找不到答案，因此非常感谢您的帮助。谢谢！

解决方法

图例指南有一个 override.aes 参数，您可以使用它来明确设置键的美感。

library(ggplot2)

ggplot(data = iris,aes(x = Sepal.Length,y = Sepal.Width,fill = Species)) + 
  geom_violin(alpha = 0.5) +
  stat_summary(aes(shape="mean",group=1),fun = "mean",size = 2,geom = "point",color = "black") +
  stat_summary(aes(shape = "median",group = 2),fun = "median",color = "red") +
  labs(x = "Sepal Length",y = "Sepal Width",shape = "Shape",colour = "Species") +
  guides(
    shape = guide_legend(override.aes = list(colour = c("black","red"))),fill = guide_legend(override.aes = list(shape = NA))
  ) +
  theme_classic() 
#> Warning: position_dodge requires non-overlapping x intervals