r - 底部多 Axis

Question

我正在尝试在 R 中的绘图底部 x Axis 下方放置一个轴。目前，我有一个轴如下:

axis(side=1, col="blue")

现在我想在该 Axis 下方添加另一个具有不同值的 Axis 。我怎样才能做到这一点？

Answer 1

我认为这就是你要找的:

这里的关键是axis线。 at指示放置标签的 tic 标记和 label说怎么称呼那个抽动标记。

x <- sample(1:100, 10, replace = T) # just 10 random numbers
y <- sample(1:100, 10, replace = T) # 10 more random numbers
par(mar = c(10, 5, 5, 5)) 
    # increasing the 1st number to 10 makes 10 lines below axis 1
plot(x~y) # normal plot
axis(1, at = c(20, 40, 60, 80), labels = c("1", "2", "3", "4"), line = 5, col = 4) 
    # the "line" indicates which of the 10 lines made above to put the axis on