r - 在 R 中为 Boxplot 添加颜色

Question

boxplot(mtcars$mpg ~ mtcars$cyl, main = "Box Plot of Mileage vs Number of Cylinders", xlab = "Number of Cylinders", ylab = "Miles per Gallon", col = "lightgreen")

我有这个代码，所有的盒子都是绿色的，我可以添加什么来使盒子颜色不同

标签： r

Answer 1

您只需要为颜色添加一个因子（x_axis_var）。

boxplot(mtcars$mpg ~ mtcars$cyl, 
        main = "Box Plot of Mileage vs Number of Cylinders", 
        xlab = "Number of Cylinders", 
        ylab = "Miles per Gallon", col = factor(mtcars$cyl))

或提供颜色向量：

boxplot(mtcars$mpg ~ mtcars$cyl, 
        main = "Box Plot of Mileage vs Number of Cylinders", 
        xlab = "Number of Cylinders", 
        ylab = "Miles per Gallon", col = c("blue","red","green"))