ggplot的每个方面都有不同的`geom_hline()` [英] Different `geom_hline()` for each facet of ggplot

问题描述

library(tidyverse)
ggplot(mpg, aes(cty, hwy)) + 
  geom_point() + 
  facet_grid(year ~ fl) + 
  geom_hline(yintercept = mean(mpg$hwy))

我希望上面显示的方面中的每个 geom_hline()是仅包含在该方面中的点的均值.我认为我可以用下面的方法做到这一点.但这是行不通的.我很近吧?

I want each geom_hline() in the facet shown above to be the mean of the points that are only contained within that facet. I would think that I could do it with something like (below). But that doesn't work. I'm close, right?

library(tidyverse)
ggplot(mpg, aes(cty, hwy)) + 
  geom_point() + 
  facet_grid(year ~ fl) + 
  geom_hline(yintercept = mean(mpg %>% group_by(year, fl)$hwy))

推荐答案

如果您希望将每个构面的值都用作数据框中的列，并且该值在每个构面内都是唯一的，则可以使用geom_hline(aes(yintercept = column))，然后将为每个构面绘制一条水平线

If you have the value you wish to use for each facet as a column in the data frame, and that value is unique within each facet, then you can use geom_hline(aes(yintercept=column)), which will then plot a horizontal line for each of the facets

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