[R] segfault 'memory not mapped', dual core problem?

[Peter Dalgaard]

Benilton Carvalho <bcarvalh at jhsph.edu> writes:

> On Nov 12, 2006, at 3:35 PM, Peter Dalgaard wrote:
> 
> >> My fix was to remap my group variable so that it would always start
> >> from 1.
> >
> > Ugh!
> >
> > You shouldn't "fix" something like that, instead try your very best to
> > find circumstances where you reproduce the crash as quickly as
> > possible, prefering using a minimal setup without external data, and
> > report it (or try debugging it yourself).
> 
> I reported on Sep 7th (the maintainer directly). But I haven't heard
> back, nor the solution implemented yet. Probably a matter of time?

Ah, good. As things should be. I'm sure Martin will get to it.

        -p

 
> Anyways, all one need to do is:
> 
> #####
> 
> require(cluster)
> set.seed(1)
> x=rnorm(100)
> g=sample(2:4, 100, replace=T)
> 
> for (i in 1:10){
>   print(i)
>   tmp1=silhouette(g, dist(x))
> }
> 
> ######
> 
> the above fails on the 2nd step, ie, i==2.
> 
> But using the code below, it works as expected.
> 
> #####
> 
> require(cluster)
> set.seed(1)
> x=rnorm(100)
> g=sample(2:4, 100, replace=T)
> 
> for (i in 1:1000){
>   print(i)
>   tmp2=silhouette(as.numeric(as.factor(g)), dist(x))
> }
> 
> ######
> 
> Btw, tmp1 and tmp2 are two different results...
> 
> Cheers,
> Benilton
> 

-- 
   O__  ---- Peter Dalgaard             Øster Farimagsgade 5, Entr.B
  c/ /'_ --- Dept. of Biostatistics     PO Box 2099, 1014 Cph. K
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