[R] Newbie question about "grouping"

[David Winsemius]

?by
?aggregate
?ave

Further specifics might be forthcoming if self-contained example data  
and desired output were offered. The help pages will have worked  
examples, of course.

-- 
David Winsemius


On Jan 28, 2009, at 9:13 AM, Rixon, John C. wrote:

> Hi folks:
>
> I am a SQL guy who just downloaded and installed R yesterday.  I am
> trying to evaluate some "complex" aggregations we are currently
> performing with Syncsort (and have tried in Oracle) with R.  I have
> loaded data in a dataframe and have performed some of the simple
> aggregations on a subset of data.  What I do not see how to do though,
> is to "group" the aggregations on a particular key value (e.g., sum
> market_value over account_id).
>
> If you can point me in the right direction I'd very much appreciate  
> it.
>
> Thanks!
>
> John
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.