r中两行之间的阴影区域 [英] shading area between two lines in r

问题描述

例如，如果我需要在情节中阴影两个区域

For example if i need to shade two area in plot

x<-rep(1:10)
plot(x,type="h")

作为示例，我需要将区域从1到3以及从7到10进行着色，

I need as an example shade the area from 1 to 3 and from 7 to 10,

我使用此命令，但省略了绘图行.

I use this commands but it omitted the lines of plot.

usr <- par('usr')
rect(1, usr[3], 3, usr[4], col='green')

推荐答案

如果我对您的理解正确，那么可以使用鲜为人知的plot.default()自变量plot.default()来获得所需的内容:

If I understand you correctly, you can get what you want by using the little-known panel.first= argument to plot.default():

plot(x,type="h", 
     panel.first = {
         usr <- par('usr')
         rect(c(1,7), usr[3], c(3,10), usr[4], col='green', border=NA)
     })

或者，为避免与par('usr')值混为一谈，只需执行以下操作:

Or, to avoid any mucking around with par('usr') values, just do:

plot(x, type="h", 
     panel.first = rect(c(1,7), -1e6, c(3,10), 1e6, col='green', border=NA))

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