R help - Oct 2011 - Difference between xyplot() and plot()

Hi,
I draw two Plots, one with xyplot() and one with plot(). Why is the
line with xyplot() not always in the middle of the dots like plot()?

library(lattice)
x<-c(1,2,3,4,5,6)
y<-x
plot.new()
plot(x ~ y, main = "Sequenz 1 und Sequenz 2", xlab="Sequenz
2",
ylab="Sequenz 1", las=1)
abline(a=0, b=1,col='red',lwd=2)

and

library(lattice)
x<-c(1,2,3,4,5,6)
y<-x
plot.new()
xyplot(x ~ y, main = "Sequenz 1 und Sequenz 2", xlab="Sequenz
2",
ylab="Sequenz 1", las=1)
abline(a=0, b=1,col='red',lwd=2)

> From:  J?rg Reuter
> 
>  Why 
> is the line with xyplot() not always in the middle of the 
> dots like plot()?
Because you used the base graphics command abline() on a lattice plot? 

They don't mix. The plot regions are different for lattice and base graphics
- notice that the second abline doesn;t go to the window edges either.

S Ellison

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