title: data.table and parallel computing
body: <p>Following this post: <a href="https://stackoverflow.com/questions/14697670/multicore-and-data-table-in-r">multicore and data.table in R</a>, I was wondering if there was a way to use all cores when using data.table, typically doing calculations by groups could be parallelized. It seems that <code>plyr</code> allows such operations by design.</p>