Please ignore my message. I figured it out myself. The way to do it is:
levels(testSeq_df[,i]) <- list(a=c('a'),c=c('c'),g=('g'),t=c('t')) Thanks, vishal [[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.