> On Apr 7, 2016, at 7:44 PM, Michael Artz <michaelea...@gmail.com> wrote: >
> I don't get it, I thought the double index was to indicate and individual > element within a column(vector)? Character values by themselves either quoted or not are not assumed to refer to column names unless you use `with` or `within`. > I will stop using data.frame, thanks a lot! You will have a lot of problems using R if you stop using data.frames. -- David. > > On Thu, Apr 7, 2016 at 9:29 PM, David Winsemius <dwinsem...@comcast.net> > wrote: > > > On Apr 7, 2016, at 6:46 PM, Michael Artz <michaelea...@gmail.com> wrote: > > > > data.frame.$columnToAdd["CurrentColumnName" == "ConditionMet"] <- 1 > > > > Can someone please explain to me why the above command gives all NAs to > > columnToAdd? I thought this was possible in R to do logical expression in > > the index of a data frame > > It is possible, but please execute this at a console line and then read ?"[" > to see what is happening: > > "CurrentColumnName" == "ConditionMet" # almost surely FALSE > > Let's assume your dataframe were named 'dat'. > > Perhaps you meant to write: > > dat$colToAdd[ dat[["CurrentColumnName"]] == dat[["ConditionMet"]] ] <- 1 > > And do please stop naming your dataframes "data.frame". > > > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > 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. > > David Winsemius > Alameda, CA, USA > > David Winsemius Alameda, CA, USA ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
