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

[Henrik Andersson]

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
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## 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))

## Try other ylim

plot(y~x,type='l',xlim=c(19,20),ylim=c(0,1))

## Not enough

plot(y~x,type='l',xlim=c(19,20),ylim=c(0,1E-8))

## Better
---------------------------------------------
Henrik Andersson
Netherlands Institute of Ecology -
Centre for Estuarine and Marine Ecology
P.O. Box 140
4400 AC Yerseke
Phone: +31 113 577473
h.andersson at nioo.knaw.nl
http://www.nioo.knaw.nl/ppages/handersson