[R] Labeling points with xYplot

[Frank E Harrell Jr]

John Poulsen wrote:
> Hello R-Users,
> 
> I am trying to label points on an xYplot.  I can label the points, but 
> then I lose the error bars.  I suspect that I should be using 
> panel.xYplot rather than panel.xyplot, but that didn't work either...
> 
> Can anybody help me out?  Example code is below.  First xYplot has error 
> bars, second tries to label the points and the bars disappear.
> 
> Thanks,
> John
> 
> 
> a=c(1:4)
> b=rnorm(4,15,5)
> blab=b+1
> 
> xYplot(Cbind(b, b-1.5, b+1.5)~a,
>        ylim=c(0,max(b)+3))
> 
> xYplot(Cbind(b, b-1.5, b+1.5)~a, ylim=c(0,max(b)+3),
>        panel=function(x,y,...){
>          panel.xyplot(x,y,...)
>          ltext(x=list(1,2,3,4),
>                y=list(13,14,15,16),
>                labels=list("A","B","C","D"), pos=2)})

One of the purposes of xYplot is to use panel.xYplot
Frank

-- 
Frank E Harrell Jr   Professor and Chair           School of Medicine
                      Department of Biostatistics   Vanderbilt University