Try: with(x, tapply(var3, list(var1, var2), length))
with(x, tapply(var3, list(var1, var2), sum)) Or with xtabs xtabs(as.logical(var3) ~ var1 + var2, data = x) xtabs(var3 ~ var1 + var2, data = x) On 4/25/08, ppaarrkk <[EMAIL PROTECTED]> wrote: > > > Can somebody tell me how to do the equivalent of a pivot table in R ? > > > For example, if I have : > > var1 var2 var3 > a x 10 > b y 20 > a z 10 > b z 20 > a z 10 > b z 20 > > I could have : > > x y z > a 1 0 2 > b 0 1 2 > > where entries in the table are counts of var3. > > x y z > a 10 0 20 > b 0 20 40 > > where entries are sums of var3. > > > > I would expect it to be tapply(), but I can't see how it would be done. > > > Any suggestions please. > > > -- > View this message in context: > http://www.nabble.com/Equivalent-of-Excel-pivot-tables-in-R-tp16906289p16906289.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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ 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.
