Sorry for a stupid question but in table() I am surprised by the behavior of R 0.65.0 (Windows): table(abc$a, abc$b) # result OK, but: zzz<-data.frame(abc$a) table(zzz, abc$b) Error: all arguments must have the same length Surely I am missing something obvious. Thanks for hints! Zdenek ++++++++++++++++++++++ ] Zdenek Skala ] e-mail: ] Zdenek.Skala at incoma.cz -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._