[datatable-help] Join and sum not compatible matrices through data.table

[Matthew Dowle]

Aaron's answer looks good to me.

Matthew

On 26.11.2012 19:15, leodido wrote:
> Hi,
>
> I'm playing with data.table package and I need some help to better
> understand it.
>
> I've posted an answer related to it (and related to join table and 
> aggregate
> results data)  here
> 
> <http://stackoverflow.com/questions/13571359/join-and-sum-not-compatible-matrices-through-data-table>
>
> (Join and sum not compatible matrices through data.table on 
> stackoverflow).
>
> If someone here can share its knowledge :)
>
> Thanks in advance.
>
> Di Donato Leonardo
>
>
>
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> 
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