The answer to your Q is surely a "no": That's exaxtly the point of tapply that the number of y values may vary. The msg tells you that the x & y full vectors must have the same length.
Hoping that helps. Martin [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.