[Rd] Fwd: segfault

[Deepayan Sarkar]

On 8/31/05, Byron Ellis <ellis at stat.harvard.edu> wrote:
> There's definitely something a bit strange going on. The arguments as
> passed to wireframePanelCalculations from the code snippet show only
> 6060 elements for the z vector (51,101,16 respectively for x,y,rot)
> while the function routinely tries to access at positions in the z
> vector >20,000... until it eventually falls over (how long this takes
> seems to depend on circumstances, I can actually get it to complete a
> run while running in gdb).

Thanks for tracking this down. It's unlikely that I'll be able to fix
this before R 2.2.0, but at least I know where to look when I do
tackle this.

> On Aug 30, 2005, at 10:12 AM, stefano iacus wrote:
> 
> >
> > On 29/ago/05, at 10:35, Prof Brian Ripley wrote:
> >
> >
> >> It does not crash for me on either Windows or Linux, but it does
> >> take a
> >> long time and the plot is a mess, so there does seem to be a
> >> lattice-related problem (maybe a usage one).
> >>
> >> However, I think the crash is a Mac (presumably quartz()) problem.
> >>
> >>
> >
> > no, it also happens with the X11 device. BTW, it seems to be OS X
> > specific.
> > I'll try to debug
> > stefano
> >
> >
> >> On Mon, 29 Aug 2005, stefano iacus wrote:
> >>
> >>
> >>
> >>> This segfaults on OS X (10.4) on both X11 and quartz devices.
> >>> Seems a problem with lattice but I cannot test on other platforms
> >>> stefano
> >>>
> >>>
> >>> Begin forwarded message:
> >>>
> >>>
> >>>
> >>>> From: "G. Sawitzki" <gs at statlab.uni-heidelberg.de>
> >>>> Date: 28 agosto 2005 14:11:18 GMT+02:00
> >>>> To: jago at mclink.it
> >>>>
> >>>>
> >>>> Dear Stefano,
> >>>>
> >>>>  this small exaple leads to a crash of R. I did not try it on
> >>>> versions other than the Mac version. So I am sending it to you
> >>>> directly. If it is a littice problem, could you pass it to Deepayan
> >>>> Sarkar? Thank you.
> >>>>
> >>>>   g.
> >>>>
> >>>> ==
> >>>> #pbinom
> >>>> library(grid)
> >>>> library(lattice)
> >>>>
> >>>> n<-20
> >>>> psteps<-50
> >>>> binomtable<- function (n,psteps){
> >>>> x<-(0:(10*n))/10
> >>>> p<- (0:psteps)/psteps
> >>>> dd<-expand.grid(x=x,p=p)
> >>>> dd$F<- pbinom(dd$x,n,dd$p)
> >>>> dd$x0<-trunc(dd$x)
> >>>> dd
> >>>> }
> >>>>
> >>>> bt<-binomtable(n=5,psteps=100)
> >>>> bt[bt$x-bt$x0>=0.9,]$F<-NA
> >>>> wireframe(bt$F~bt$x*bt$p,bt,groups=bt$x0,shade=TRUE) # leads to R
> >>>> crash
> >>>> #wireframe(bt$F~bt$x*bt$p,bt,shade=TRUE) #ok
> >>>>
> >>>>
> >>
> >> --
> >> Brian D. Ripley,                  ripley at stats.ox.ac.uk
> >> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> >> University of Oxford,             Tel:  +44 1865 272861 (self)
> >> 1 South Parks Road,                     +44 1865 272866 (PA)
> >> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
> >>
> >> ______________________________________________
> >> R-devel at r-project.org mailing list
> >> https://stat.ethz.ch/mailman/listinfo/r-devel
> >>
> >>
> >>
> >
> > ______________________________________________
> > R-devel at r-project.org mailing list
> > https://stat.ethz.ch/mailman/listinfo/r-devel
> >
> 
> ---
> Byron Ellis (ellis at stat.harvard.edu)
> "Oook" -- The Librarian
> 
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