如何确定boxplot的横坐标

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求助：

   我想要在boxplot上添加一条连接各组中位数的线，那么如何确定各组在x轴上的坐标？
boxplot(len ~ dose, data = ToothGrowth,
        subset = supp == "VC", col = "yellow",
        main = "Guinea Pigs' Tooth Growth",
        xlab = "Vitamin C dose mg",
        ylab = "tooth length",
        xlim = c(0.5, 3.5), ylim = c(0, 35), yaxs = "i",
        boxwex = 0.0001, staplewex =800
        )

#a <- locator(3)
lines(a$y~ a$x,type= "l")


代码中我用最原始的办法确定各组中位数的坐标：locator函数，不知道有没有其他的办法确定中位数的坐标，或是横坐标（纵坐标非常容易求出）

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关键词：BOXPLOT plot box 横坐标 Growth 如何

Following your first command:

1. a <- with(subset(ToothGrowth, supp == "VC"), tapply(len, dose, median))
   
2. 
   
3. lines(as.numeric(as.factor(names(a))), a)

复制代码

The (horizontal) position of a box plot can be specified using the "at" parameter in the "boxplot" function which, according to the documentation, "defaults to 1:n where n is the number of boxes".

zhangyangsmith 发表于 2015-1-8 04:39
Following your first command:

The (horizontal) position of a box plot can be specified using the  ...

Thanks a lot ! It work!

zhangyangsmith 发表于 2015-1-8 04:39
Following your first command:

The (horizontal) position of a box plot can be specified using the  ...

I understood now ! The the (horizontal) position of a box plot just the indexes of the boxes !
Finally!

zhangyangsmith 发表于 2015-1-8 04:39
Following your first command:

The (horizontal) position of a box plot can be specified using the  ...

I understood now ! The the (horizontal) position of a box plot just the indexes of the boxes !
Finally!

fivenum()