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

[Petr Pikal]

Hi

Not avoiding trial and error but you can do it interactively by point 
clicking on a plot.

> replot
function (x, y, type = "l") 
{
    body <- locator(2)
    plot(x, y, xlim = range(body$x), ylim = range(body$y), type = 
type)
}
>

HTH

Best regards
Petr Pikal



On 26 Jul 2005 at 10:16, Henrik Andersson 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))
> 
> ## 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
> 
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Petr Pikal
petr.pikal at precheza.cz