Dear all

I have a code like

x<-1:10
y1<-x+runif(10)*2
y2<-seq(0,50,length.out=10)+rnorm(10)*10

par(mfrow=c(1,2))
plot(y1~x)
plot(y2~x)

Now I would like to plot y1 and y2 on the same graph, with its two scales
(y1 on left and y2 on rigth side).

Any help are welcome.

Kind regards

Miltinho

Brazil

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