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我需要用粗体显示那些“+”。有可能还是应该使用其他符号?
plot(1:10,1:10,type="l") points(1:10,rep(5,10),pch="+")
您可以text使用font=2:
text
font=2
plot(1:10,1:10,type="l") text(1:10,rep(5,10),label="+",font=2)
尝试pch=3和lwd
pch=3
lwd
plot(1:10,1:10,type="l") points(1:10,rep(5,10),pch=3,lwd=5)