> 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 ______________________________________________ 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.
