[R] refering to the 'boundaries' of a graph

[Henrique Dallazuanna]

Try this:

par("usr") give the boundaries.

abline(v = par("usr")[1], col = "red", lwd = 2)
abline(v = par("usr")[2], col = "red", lwd = 2)

On Mon, Dec 28, 2009 at 11:55 AM, Dean1 <web13site at yahoo.co.uk> wrote:
>
> Please see this code for a demonstration of my problem...
>
> xlim <- c(-1,5)
> plot(1:4, xlim=xlim)
> abline(v=xlim[1])
> abline(v=xlim[2])
>
> When I refer to xlim, it is not referring to the boundaries of the graphical
> region, it refers to the maximum and minimum xticks.  My question is how can
> I refer to the x axis boundaries (and similarly y axis) of the graph?
> --
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>
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-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O