Excellent! I knew there would be a clever answer using 'do.call' :-) -----Original Message----- From: Charles C. Berry [mailto:cbe...@tajo.ucsd.edu] Sent: Tuesday, February 02, 2010 4:25 PM To: Steve Jaffe Cc: r-help@r-project.org Subject: Re: [R] tapply for function taking of >1 argument?
On Tue, 2 Feb 2010, sjaffe wrote: > > 'fraid not :-(( > > tapply( data, groups, weighted.mean, weights) > > won't work because the *entire* weights vector is passed as the 2nd arg to > weighted.means. But weighted.mean needs 'weights' to be split in the same > way as 'data' -- the first and 2nd args need to correspond. > try sapply( split( data.frame(x,w), grp) , do.call, what=weighted.mean ) HTH, Chuck > > Jorge Ivan Velez wrote: >> >> Hi sjaffem, >> >> You were almost there: >> >> tapply( yourdata, groups, weighted.mean, weights) >> >> See ?tapply for more information. >> >> HTH, >> Jorge >> >> >> > > -- > View this message in context: > http://n4.nabble.com/tapply-for-function-taking-of-1-argument-tp1460392p1460419.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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. > Charles C. Berry (858) 534-2098 Dept of Family/Preventive Medicine E mailto:cbe...@tajo.ucsd.edu UC San Diego http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901 ______________________________________________ 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.