[R] "Reversal" of Aggregation

From: Roland Rau <roland.rproject_at_gmail.com>
Date: Mon 29 Jan 2007 - 21:58:42 GMT


Dear all,

given I have a data.frame in a format like this

mydf <- data.frame(age=rep(1:3,5),

                   year=c(rep(1996,3), rep(1997,3), rep(1998,3),
                     rep(1999,3), rep(2000,3)),
                   income=1:15)

mydf

Now I convert it to some 2D-frequency table like this: mymatrix <- tapply(X=mydf$income, INDEX=list(mydf$age, mydf$year),

                   FUN=sum)

mymatrix

My question is:
How can I go the opposite way, i.e. from 'mymatrix' to 'mydf'? Is there an elegant way?

Thanks,
Roland

        [[alternative HTML version deleted]]



R-help@stat.math.ethz.ch 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. Received on Tue Jan 30 09:02:51 2007

Archive maintained by Robert King, hosted by the discipline of statistics at the University of Newcastle, Australia.
Archive generated by hypermail 2.1.8, at Mon 29 Jan 2007 - 22:30:42 GMT.

Mailing list information is available at https://stat.ethz.ch/mailman/listinfo/r-help. Please read the posting guide before posting to the list.