Try this: subset(d, TRUE, select=c( 'a', 'b', 'c' ))
On Mon, Aug 23, 2010 at 7:15 PM, ivo welch <ivo.we...@gmail.com> wrote: > I would not have wanted a data set with 1000 variables, but an error > message. the intent was > > d=data.frame( a=1:1000, b=2001:3000, z= 5001:6000 ) > attach(d); d$c <- (a+b)>25; detach(d) > d= subset(d, TRUE, select=c( a, b, c )) > > -iaw > > > On Mon, Aug 23, 2010 at 6:04 PM, Erik Iverson <er...@ccbr.umn.edu> wrote: > > > > > > ivo welch wrote: > >> > >> quizz---what does this produce? > >> > >> d=data.frame( a=1:1000, b=2001:3000, z= 5001:6000 ) > >> attach(d); c <- (a+b)>25; detach(d) > >> d= subset(d, TRUE, select=c( a, b, c )) > >> > >> yes, I know I have made a mistake, in that the code does not do what I > >> presumably would have wanted. > > > > What exactly did you want? > > > > ______________________________________________ > 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.
