[R] Problem with mclapply -- losing output/data

[Uwe Ligges]

Janet,

1. you posted to the R-help mailing list rather than to "Elizabeth",
2. if posting to a mailing list, please quote the original thread 
otherwise we do not know what you are talking about if we removed the 
prior part of the thread.

Uwe Ligges



On 23.06.2011 04:22, Janet Young wrote:
> Hi Elizabeth,
>
> I just found your thread after experiencing a similar problem (I was also
> using some IRanges/GenomicRanges functions).  You've probably figured it
> out by this time - I'm actually curious to know what you found?
>
> I think I've tracked it down in my case, where a small minority of the
> elements I was trying to lapply/mclapply over caused a genuine error
> (perhaps in your case a genuine NULL answer - is that possible?).  When
> I used lapply that error was very obvious - it came up on the screen.
> But when I used mclapply it looked like the function completed fine -
> it wasn't until later that I saw the error was captured as a string
> object in the relevant slot of  the list object returned by mclapply.
> I should build in some checking if I want to persist with using
> mclapply.
>
> I wonder if something similar is going on in your case?
>
> Janet
>
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