The thing to remember is that ifelse is a function, it returns a value, so usually one does not need assignments within the function call.
You also could do: negindices <- dir=="-" gc_content[negindices] <- -gc_content[negindices] Eik Vettorazzi wrote: > d <- ifelse(dir == "-", -gc_content , gc_content) > works. You need not assign gc_content a new value in each comparison, > because then your "result" depends only on the last value of "dir", > which happened to be "-", so you got -0.5 for all gc_content. > > hth > -- Erich Neuwirth, University of Vienna Faculty of Computer Science Computer Supported Didactics Working Group Visit our SunSITE at http://sunsite.univie.ac.at Phone: +43-1-4277-39464 Fax: +43-1-4277-39459 ______________________________________________ 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.
