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

[leodido]

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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