A simpler version of your "puzzling call to ifelse" is ifelse(FALSE, character(0), integer(0))
The most obvious way to satisfy the requirements stated in the documentation is to extend integer(0) to length 1 by creating an NA value, and that's what you get as a return value (here the 'test' argument has length 1, and the 'no' argument has length 0). -- Tony Plate [EMAIL PROTECTED] wrote: > Hi! > > I'm puzzled by the return value of ifelse > > consider > > x<-integer(0) > ifelse(is(x, "character"), paste(x), x) > [1] NA > > whereas > if (is(x, "character")) return(paste(x)) else x > [1] integer(0) > > or > x<-integer(1) > ifelse(is(x, "character"), paste(x), x) > [1] 0 > > work as I had anticipated. Is this correct behaviour? > > Regards, > > Matthias > > > >sessionInfo() > R version 2.5.0 (2007-04-23) > i686-pc-linux-gnu > > locale: > C > > attached base packages: > [1] "stats" "graphics" "grDevices" "datasets" "utils" "methods" > [7] "base" > > other attached packages: > rcompletion rcompgen > "0.1-2" "0.1-10" > > > ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
