[R] Group by in R

[Nick Angelou]

Thanks a lot, guys. Gabor's and Mike's suggestion worked. Duncan's did not do
exactly what I expected (I guess it's the "paste" in Mike's that makes
"table" work as I needed it).

One more question - is there a convenient way to order the group by results
as follows:

As rows: the unique combinations of factors f1, f2, f3, as columns the
unique values of f4. The counts are basically the same as of the GROUP BY
statement (or the paste and table combination suggested by Mike).  Only the
way the result is structured is different.

Thanks,
Nick


Nick Angelou 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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