Hi, I am trying to convert a data frame from:
X1 X2 A 1 2 B 3 4 C 5 6 to: A01 1 A02 2 B01 3 B02 4 C01 5 C02 6. How can I do it in R? I appreciate your help. Zheng --------------------------------- [[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.