我想更改堆积条形图的顺序。
例如,在mpg
我想订购c("4", "r", "f")
是改变因素水平的唯一方法吗?
library(ggplot2)
library(dplyr)
s <- ggplot(mpg, aes(fl, fill=drv)) + geom_bar(position="stack")
s
输入数据的结构是字符:
str(mpg$drv)
> chr [1:234] "f" "f" "f" "f" "f" "f" "f" "4" "4" "4" "4" "4" "4" "4" "4" "4" "4" "4" "r" "r" "r" "r" "r" "r" "r" "r" "r" "r" "4" "4" "4" "4" "f" "f" "f" "f" "f" "f" "f" "f" "f" "f" "f" ...
ggplot 会自动将字符串转换为因子。您可以看到默认排序如下,此转换按字母顺序对它们进行排名:
levels(as.factor(mpg$drv))
> "4" "f" "r"
要在不更改原始数据的情况下对条形图重新排序,您可以重构图中本身的变量:
ggplot(mpg, aes(fl, fill = factor(drv, levels=c("4", "r", "f")))) +
geom_bar(position="stack") +
labs(fill = "Drive")
比较结果:
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