[R] Define ylim in lattice plot based upon panel function output

[Deepayan Sarkar]

On Tue, Apr 19, 2011 at 7:38 AM, Sébastien Bihorel <pomchip at 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)
>       })
>
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>
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