[Rd] xyplot,grid.text segfault (PR#948)

[Peter Dalgaard BSA]

p.malewski@tu-bs.de writes:

> First, thank you very much for that lattice-package, second, the code
> below segfaults R:
> 
> zz <- data.frame(
>                  y=rnorm(100),x=rnorm(100),z=round(rnorm(100)),
>                  g=as.character(rep(1:2,50)))
> xyplot(y~ x|z,data=zz,groups=g,
>             panel = function(x, y, subscripts, groups)  
>             grid.text(x=x, y=y, label=groups[subscripts])
>        )
> 
> I'm not sure if I have understood that panel stuff right, but anyway,
> it shouldn't segfault. BTW: I also unsure if I have to use the
> develop-version of R & whether lattice bugs should be submitted
> (because of the devel-status??).

Well, it is easier for us to deal with erroneously submitted bug than
erroneously unsubmitted ones. We have an Add-Ons category on r-bugs to
put it in. 

Lattice is closely associated with the core team, so we'd be able to
track this kind of problem. With some other packages which we do not
maintain, we have some trouble figuring out whether a report has been
solved or whether it was even a bug in the first place (it would be
nice if the original submitters would lend a hand there).

As I remember it, Paul and Deepayan were somewhat vague about exactly
what was required, except that you'd need something relatively recent.
A segfault certainly looks like a real bug.

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: (+45) 35327907
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