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.
