[英]barplot labels in R: add horizontal lines below the plot region
You can add text with mtext
您可以使用mtext
添加文本
mtext("E", side = 1, line = 3, adj = 0.375)
mtext("F", side = 1, line = 3, adj = 0.875)
and then draw line with lines
but indicating xpd=T
然后用lines
画线,但表示xpd=T
lines(c(0,3.5),c(-10,-10),xpd=TRUE)
lines(c(3.8,4.8),c(-10,-10),xpd=TRUE)
Thanks to Pascal. 感谢Pascal。 I got another answer. 我得到了另一个答案。
x <- c(10, 50, 20, 40)
barplot(x, names.arg=LETTERS[1:4])
mtext("E", side = 1, line = 3, adj = 0.375)
mtext("F", side = 1, line = 3, adj = 0.875)
axis(1, at=c(0.5,1,2,3,3.3), line=2.5, tick=T, labels=rep("",5), lwd=2, lwd.ticks=0)
axis(1, at=4+c(0.1,0.2,0.3,0.4,0.5),line=2.5,tick=T,labels=rep("",5), lwd=2, lwd.ticks=0)
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