[R] Plot zooming i.e. changing ylim according to xlim

[Deepayan Sarkar]

On 7/26/05, Henrik Andersson <h.andersson at nioo.knaw.nl> wrote:
> Dear R-gurus,
> 
> I would like to zoom in a plot, e.g. I select a region on the x-axis and
> then I would like the ranges on the y-axis to change accordingly.
> 
> Is it possible to do this with existing functions, or do I have to
> invent some data selection before plotting?
> 
> See below a short example, where I select ylim with trial and error,
> which I want to avoid.
> 
> Cheers, Henrik Andersson
> --------------------------------------------------------------------
> ## Example -- in reality more numbers, no function
> x <- seq(0,20)
> y <- exp(-x)
> 
> plot(y~x,type='l')
> 
> ## Zoom in the end, to see what's happenning
> 
> plot(y~x,type='l',xlim=c(19,20))

I tend to use constructs like 

plot(y~x,type='l', subset = x > 15)

(18 is not very interesting).

Deepayan