On Wed, Jan 28, 2009 at 8:13 AM, Rixon, John C. <jcri...@wellington.com> 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.
Have a look at the plyr package, http://had.co.nz/plyr, and associated documentation. If you're doing pivot table type aggregations, you might also want to have a look at the reshape package, http://had.co.nz/reshape. Hadley -- http://had.co.nz/ ______________________________________________ R-help@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.
