[英]barplot labels in R: add horizontal lines below the plot region
感谢Pascal。 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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