[R] plot of 2 time series with very different values

[Gabor Grothendieck]

There is an example in the example section of plotting two time series
on the same plot with different left hand and right hand scales here:

library(zoo)
?plot.zoo

On 3/2/07, Berta <ibanez at bioef.org> wrote:
>
> Hi R-Users,
>
> I am trying to plot two time series in the same plot, but they measure
> different things and hence one
>  has values around 1-9 (Use=c(7,8, 6, 2, 3)), and the other one around
> 20-100 (Resitance=c(80, 100, 95, 35, 28)). I have thought of plotting both
> in the same graph but with two axes, one from 1 to 9 and the other from 20
> to 100. To do so, I needed to do a regression for corrsepondence (1 goes to
> 20 and 9 goes to 100); the code to produce the graph would be:
>
> plot(1996:2000, xlim=c(1996, 2000),ylab="Resistence", ylim=c(20,100),
> type="n", xlab="Date")
> lines(1996:2000, c(80, 100, 95, 35, 28), col=1)
> axis(side=4, at=c(20,30,40,50,60,70,80,90,100), labels=c(1:9))
> lines(1996:2000, lsfit(c(1,9),c(20,100))$coef[1]+
> lsfit(c(1,9),c(20,100))$coef[2]*c(7,8,6, 2, 3), col=2)
> legend(1998.5, 90, legend=c("Resistence", "Use"), fill=c(1,2))
>
> However, I suspect there are better ways to do so, and I would like to know
> one because I have to do that many times.
>
> Thanks a lot in advance,
>
> Berta
>
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