This might be hard. How to tell f is to be changed while h is NOT ...
Thanks, Guanrao http://www.myfav5.com where fun and easy friend-making happens ________________________________ From: Frank Harrell <f.harr...@vanderbilt.edu> To: RHELP <r-h...@stat.math.ethz.ch> Sent: Wednesday, August 14, 2013 11:13 PM Subject: [R] regex challenge I would like to be able to use gsub or gsubfn to process a formula and to translate the variables but to ignore expressions in the formula. Supposing that the R formula has already been transformed into a character string and that the transformation is to convert variable names to upper case and to append z to the names, an example would be to convert y1 + y2 ~ a*(b + c) + d + f * (h == 3) + (sex == 'male')*i to Y1z + Y2z ~ Az*(Bz + Cz) + Dz + Fz * (h == 3) + (sex == 'male')*Iz. Any expression that is not just a simple variable name would be left alone. Does anyone want to try their hand at creating a regex that would accomplish this? Thanks Frank -- Frank E Harrell Jr Professor and Chairman School of Medicine Department of Biostatistics Vanderbilt University ______________________________________________ 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. [[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.
