[R] Plotting multiple layers(maps) on same page

[Wu Gong]

Do you want to put two figures into one pdf page?
pdf(file="testpdf.pdf")
par(mfrow = c(2, 1))
plot((1:20)^2,1:20,type="b",lwd=4,col="blue")
lines((1:20)^3,1:20,type="b",lwd=4,col="red")
plot((1:20)^4,1:20,type="b",lwd=4,col="green")
lines((1:20)^5,1:20,type="b",lwd=4,col="yellow")
dev.off()

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A R learner.
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