R graph with two y-axes

February 4, 2008

(This article was first published on "R-bloggers" via Tal Galili in Google Reader, and kindly contributed to R-bloggers)

I’ve been asked how to do this several times, so I thought it might help to put an example online.

x <- 1:5
y1 <- rnorm(5)
y2 <- rnorm(5,20)
plot(x, y2,,type="l",col="blue",xaxt="n",yaxt="n",xlab="",ylab="")

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