plot(1:20, 2:21, type="n") '#绘制lines()d的绘图空间，因为lines()只能在现有图像上进行绘图，结果为示例一
abline(h=1:20, v=2:21, col="lightgray", lty=3, lwd=1) #给前面绘制的图像添加辅助线，结果为示例二；可省略
lines(1:15, 2:16, col="red") #绘制第一条线，结果为示例三
lines(2:25, rev(3:26), col="blue") #绘制第二条线，结果为示例四
示例一
示例二
示例三
示例四
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本文标题：lines()
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