Thanks, Sarah, your answer is, indeed, revealing: --8<---------------cut here---------------start------------->8--- > z <- data.frame(a=c(1,2,3),b=c(5,6,NA)) > z a b 1 1 5 2 2 6 3 3 NA > z[z$b==6,] a b 2 2 6 NA NA NA --8<---------------cut here---------------end--------------->8--- why do I get an extra "all NA" row?
> * Sarah Goslee <fnenu.tbf...@tznvy.pbz> [2012-09-19 13:54:56 -0400]: > > Well, you have no reproducible example, but I suspect either of these > will fix it: > > locals <- z[z$country == mycountry & !is.na(z$country),] > > locals <- subset(z, country == mycountry) > > Sarah > > On Wed, Sep 19, 2012 at 1:50 PM, Sam Steingold <s...@gnu.org> wrote: >> I see this: >> --8<---------------cut here---------------start------------->8--- >>> length(which(is.na(z$language))) >> [1] 0 >>> locals <- z[z$country == mycountry,] >>> length(which(is.na(locals$language))) >> [1] 229 >> --8<---------------cut here---------------end--------------->8--- >> where are those locals without the language coming from?! >> -- Sam Steingold (http://sds.podval.org/) on Ubuntu 12.04 (precise) X 11.0.11103000 http://www.childpsy.net/ http://americancensorship.org http://honestreporting.com http://truepeace.org http://ffii.org .ACMD setaloiv siht gnidaeR ______________________________________________ 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.