Hi Jim, R, What you just showed me simply prints out the 2nd column. If you inspect your original data, it still just has 1 column. So its still passing by value.
Thanks, Sachin On Tue, Aug 14, 2012 at 11:19 AM, jim holtman <jholt...@gmail.com> wrote: > You have to return the value of 'data' from the function. Functions > do not have "side effects". > > > data<-data.frame(col1=c(1,2,3,4,5)) > > > > getcol2<-function(data){ > + data$col2[data$col1<=2]="L" > + data # return value > + } > > > > getcol2(data) > col1 col2 > 1 1 L > 2 2 L > 3 3 <NA> > 4 4 <NA> > 5 5 <NA> > > > > > On Mon, Aug 13, 2012 at 9:08 PM, Sachinthaka Abeywardana > <sachin.abeyward...@gmail.com> wrote: > > Hi all, > > > > I want to do the following: > > > > data<-data.frame(col1=c(1,2,3,4,5)) > > > > getcol2<-function(data){ > > data$col2[data$col1<=2]="L" > > } > > > > getcol2(data) > > > > Unfortunately in the above col2 does not appear in the final data. So how > > would you pass this by reference such that you would get it back? > > > > Thanks, > > Sachin > > > > [[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. > > > > -- > Jim Holtman > Data Munger Guru > > What is the problem that you are trying to solve? > Tell me what you want to do, not how you want to do it. > [[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.