R help - Nov 2010 - xlim=c(min(x), max(x)) still produces extra margin on both sides of x axis in plot()

code:
op <-
par(bg='black',fg='gray',col='gray',col.axis='gray',col.lab='gray',col.main='gray',col.sub='gray',mai=c(0,0,0,0),
tck = 0.01, mgp = c(0, -1.4, 0), mar=c(0,0,0,0))
plot(x,y,ylim=c(-20,20),xlim=c(min(x),max(x)),pch='X',col = rgb(1,1,1,
0.5),yaxt="n", ann=FALSE)
abline(v=c(min(x),max(x)), lty=3, col="yellow")
par <- op

render:
http://i51.tinypic.com/2rz9w0h.png

So what I mean is the area between yellow lines and edges of the plotting
area, so min(x) and max(x) would be really on the edge of the plot.
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i found solution myself:

par(xaxs = "i", yaxs = "i") - it sets axis ranges to actual
data ranges

sorry for question but maybe this will be easier to find if someone would be
searching for this
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Hi!

After plotting, take a look at par()$usr; it gives you the coordinates 
of the plotting region.
You could use it that way:
abline(v=c(par()$usr[1], par()$usr[2])...)

Note that you can also use it like this: par("usr")[1]

HTH,
Ivan

Le 11/22/2010 11:04, madr a ?crit :
> code:
> op<-
>
par(bg='black',fg='gray',col='gray',col.axis='gray',col.lab='gray',col.main='gray',col.sub='gray',mai=c(0,0,0,0),
> tck = 0.01, mgp = c(0, -1.4, 0), mar=c(0,0,0,0))
> plot(x,y,ylim=c(-20,20),xlim=c(min(x),max(x)),pch='X',col =
rgb(1,1,1,
> 0.5),yaxt="n", ann=FALSE)
> abline(v=c(min(x),max(x)), lty=3, col="yellow")
> par<- op
>
> render:
> http://i51.tinypic.com/2rz9w0h.png
>
> So what I mean is the area between yellow lines and edges of the plotting
> area, so min(x) and max(x) would be really on the edge of the plot.
-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. S?ugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

**********
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