这是我创建的示例ggplot点图:
为此,我使用了以下代码:
mtcars$cyl<-as.character(mtcars$cyl)
ggplot(
mtcars,
aes(fill=cyl,
y=gear,
x=mpg)) +
geom_line(aes(group = gear)) +
geom_vline(xintercept = mean(mtcars$mpg), linetype="dotted",
color = "black", size=1) +
geom_point(aes(color = cyl),size=5) +
theme_bw() +
theme(axis.line = element_line(colour = "black"),
panel.grid.major = element_blank(),
panel.grid.minor = element_blank(),
panel.border = element_blank(),
panel.background = element_blank())
我真正想要的是第二个图例,描述虚线是整体平均值。它看起来像这样:
我怎样才能做到这一点?
这可以是一种解决方案:
library(tidyverse)
mtcars$cyl<-as.character(mtcars$cyl)
d_me <-
mtcars %>%
summarize(me = mean(mpg)) %>%
mutate(var = "overall \n mean")
mtcars %>%
ggplot(
aes(fill=cyl,
y=gear,
x=mpg)) +
geom_line(aes(group = gear)) +
geom_point(aes(color = cyl),size=5) +
geom_vline(data = d_me, aes(xintercept = me, linetype = var),
color = "black", size=1) +
scale_linetype_manual(values = "dotted", name = "") +
theme_bw() +
theme(axis.line = element_line(colour = "black"),
panel.grid.major = element_blank(),
panel.grid.minor = element_blank(),
panel.border = element_blank(),
panel.background = element_blank())
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