[R] Group by in R

Gabor Grothendieck ggrothendieck at gmail.com
Mon Apr 13 13:09:27 CEST 2009


You can use SQL commands directly on R data frames with the R sqldf package:
See home page:

http://sqldf.googlecode.com

On Mon, Apr 13, 2009 at 6:33 AM, Nick Angelou <nikolay12 at yahoo.com> wrote:
>
> Hi,
>
> I have the following table data:
>
> f1, f2, f3, f4.
>
> I want to compute the counts of unique combinations of f1-f4. In SQL I would
> just write:
>
> SELECT COUNT(*) FROM <table> GROUP BY f1, f2, ..,f4.
>
> How to do this in R?
>
> Thanks,
>
> Nick
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