"Joshua Wiley" <jwiley.ps...@gmail.com> wrote in message 
news:canz9z_kopuwkzb-zxr96pvulhhf2znxntxso9xnyho-_jum...@mail.gmail.com...
> On Tue, Oct 4, 2011 at 12:40 AM, Rainer Schuermann
> <rainer.schuerm...@gmx.net> wrote:
>>> Any comments are very welcome,
>>
>> 3. If that fails, and nobody else has a better idea, I would consider 
>> using a database engine for the job.
>
> Not a bad idea for working with large datasets either.
>
or, the data.table package
http://datatable.r-forge.r-project.org/

Matthew

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