gs up further if you have a multiprocessor system
> with the doMC package to run iterations in parallel. There's an example
> here:
> http://blog.revolution-computing.com/2009/08/blockprocessing-a-data-frame-with-isplit.html
> Hope this helps,
> # David Smith
> On Wed, Sep 2, 2009
I have a data frame with about 10^6 rows; I want to group the data
according to entries in one of the columns and do something with it.
For instance, suppose I want to count up the number of elements in
each group. I tried something like aggregate(my.df$my.field,
list(my.df$my.field), length) but
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