将平均值添加到绘图中的 y 轴

Question

我希望样本的平均值显示在我的 y 轴上。我试着像他们在 this post 中解释的那样做，但它似乎不起作用。如果你看image，红线代表平均值。我只需要在 y 轴上显示值。任何帮助表示赞赏。

我的 R 代码：

xyear = seq(1920,1978,1)
plot(xyear,difference, type = "bar", col = "blue", main = "Difference between precipitation in winter and summer", xlab = "Year", ylab = "Difference")
abline(difference.mean, 0, col = "red")

谢谢！

Answer 1

xyear = seq(1920,1978,1)
plot(xyear,difference, type = "bar", col = "blue", main = "Difference between precipitation in winter and summer", xlab = "Year", ylab = "Difference")
abline(mean(difference), 0, col = "red")
axis(side = 2, at=mean(difference), labels=T)

axis 命令在这种情况下应该会有所帮助。如需更多信息，this page 可能会有所帮助。