Dear Deepayan,

Thank you for pointing out those functions. They will be helpful to me. If
you don't mind, I may get back to you on that topic if I cannot find a way
to apply them to my actual problem (the example I gave was just for
illustration). This problem is more complex and involves multiple
panel.xyplot, panel.superpose, panel.abline, panel.loess, panel.lines and
grid.polygon calls, all conditional on the settings of the xyplot call...
This is going to be fun

Sebastien

On Mon, Apr 18, 2011 at 10:46 PM, Deepayan Sarkar <deepayan.sarkar@gmail.com
> wrote:

> On Tue, Apr 19, 2011 at 7:38 AM, Sébastien Bihorel <pomchip@free.fr>
> wrote:
> > Dear R-users,
> >
> > By default, the xyplot function automatically defines the axis ranges
> based
> > upon the content of y and x variables. However, when one includes some
> calls
> > to other panel.<something> functions in the panel argument, the results
> > might be out of range and not show up in the final graphs (see lower ends
> of
> > the loess line in the following example). Is there a way one can capture
> the
> > results of the functions to update the graph object and set the xlim and
> > ylim?
>
> Read up on the 'prepanel' argument (in ?xyplot). What you want is
> actually already defined -- see ?prepanel.loess.
>
> xyplot(y~x,data=df,
>        prepanel = prepanel.loess,
>        panel=function(x,y,...){
>           panel.xyplot(x,y)
>           panel.loess(x,y)
>       })
>
> -Deepayan
>
> >
> > Thanks
> >
> > Sebastien
> >
> > require(lattice)
> >
> > df <- data.frame(x=seq(1,30,1),
> >                 y=c(rep(0,10),rep(10,10),rep(0,10)))
> >
> > xyplot(y~x,data=df,
> >       panel=function(x,y,...){
> >         panel.xyplot(x,y)
> >         panel.loess(x,y)
> >       })
> >
> >        [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help@r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-help
> > PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>

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