[Rd] Fwd: segfault

[Prof Brian Ripley]

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.

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