r - 向水平箱线图添加点

Question

我使用以下代码生成多个箱线图，按变量的平均值排序：

zx <- replicate (5, rnorm(50))
zx_means <- (colMeans(zx, na.rm = TRUE))
colnames (zx) <- seq_len (ncol (zx))
boxplot(zx [, order (zx_means)], horizontal = FALSE, outline = FALSE)
points(zx_means [ order (zx_means)], pch = 22, col = "darkgrey", lwd = 7)

（有关详细信息，请参阅此帖子）

当我将代码更改为 时horizontal = TRUE，我无法使这些点与箱线图对齐。关于如何正确添加points到水平箱线图的任何想法？

Answer 1

您需要同时给出 x 和 y 坐标：

points(zx_means[order (zx_means)], seq_along(zx_means), 
       pch = 22, col = "darkgrey", lwd = 7)

或者

points(zx_means, order (zx_means), pch = 22, col = "darkgrey", lwd = 7)