将图例添加到geom_vline [英] Add legend to geom_vline

问题描述

我知道之前曾有人问过这个问题，但是解决方案似乎对我不起作用.

I know that this question has been asked before but the solutions don't seem to work for me.

我想做的是在直方图上用不同的颜色表示我的中位数，均值，上下分位数，然后在图上添加图例.到目前为止，这就是我想要的，并且我尝试使用scale_color_manual和scale_color_identity给我一个图例.似乎没有任何作用.

What I want to do is represent my median, mean, upper and lower quantiles on a histogram in different colours and then add a legend to the plot. This is what I have so far and I have tried to use scale_color_manual and scale_color_identity to give me a legend. Nothing seems to be working.

quantile_1 <- quantile(sf$Unit.Sales, prob = 0.25)
quantile_2 <- quantile(sf$Unit.Sales, prob = 0.75)

ggplot(aes(x = Unit.Sales), data = sf) + 
  geom_histogram(color = 'black', fill = NA) + 
  geom_vline(aes(xintercept=median(Unit.Sales)),
            color="blue", linetype="dashed", size=1) + 
  geom_vline(aes(xintercept=mean(Unit.Sales)),
            color="red", linetype="dashed", size=1) +
  geom_vline(aes(xintercept=quantile_1), color="yellow", linetype="dashed", size=1)

推荐答案

您需要在aes中映射颜色:

ggplot(aes(x = Sepal.Length), data = iris) + 
  geom_histogram(color = 'black', fill = NA) + 
  geom_vline(aes(xintercept=median(iris$Sepal.Length),
                 color="median"), linetype="dashed",
             size=1) +
  geom_vline(aes(xintercept=mean(iris$Sepal.Length),
                 color="mean"), linetype="dashed",
             size=1) +
  scale_color_manual(name = "statistics", values = c(median = "blue", mean = "red"))

这篇关于将图例添加到geom_vline的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！