To close this thread on-list :
packageVersion() was added to R in 2.12.0.
data.table's dependency on 2.12.0 is updated, thanks.
Matthew

"Jesse Brown" <jesse.r.br...@lmco.com> wrote in message 
news:4e1b21a8.8090...@atl.lmco.com...
> Matthew Dowle wrote:
>> Hi,
>>
>> Try package 'data.table'. It has a concept of keys which allows you to do
>> exactly that.
>>
>> http://datatable.r-forge.r-project.org/
>>
>> Matthew
>>
>>
> Hi Matthew,
>
> Unfortunately, the load of that library fails (it builds successfully).
> I'm currently looking into why. Error output looks something similar to:
>
>
> > library(data.table)
> Error in .makeMessage(..., domain = domain, appendLF = appendLF) :
>  could not find function "packageVersion"
> Error : .onAttach failed in 'attachNamespace'
> Error: package/namespace load failed for 'data.table'
>
>
> I googled around a bit and there is mention of a bug in packageVersion but 
> there was no solution that I found. Is this something that is easily 
> overcome?
>
>
> Thanks,
>
> Jesse
>

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