[R] Group by in R

[Mike Lawrence]

One way:

g= paste(f1,f2,f3,f4)
table(g)

On Mon, Apr 13, 2009 at 7:33 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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>
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-- 
Mike Lawrence
Graduate Student
Department of Psychology
Dalhousie University

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