Hi -- I had a pretty quick R question since unfortunately I have not been able to find an answer on Google. It shouldn't take much more than a minute to answer.
I'm trying to add up the major gleason grade and minor gleason grade for an analysis of patients with prostate cancer. One column has values under "Major Gleason" and another column has values under "Minor Gleason." For example, Major Gleason Minor Gleason 4 3 5 2 2 4 3 3 I want my output to be: "4+3" "5+2" "2+4" "3+3" The quasi-pseudocode in Java is basically: major = column$majorGleason minor = column$minorGleason for item in len(Major Gleason) { string s = major(item) "+" minor(item); } return s; But trying the same idea in R: string <- major "+" minor gives me an error: "unexpected string constant in..." I would greatly appreciate any help. Thanks, Ben [[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.