Thanks Henrique! It solves the problem of having the column "N" with unreal number of individuals since N=1
with Petr's example: expand <- transform(dat[rep(1:nrow(dat), times=dat$N), ] ,N=1) rownames(expand) <- NULL expand > expand animal N 1 a 1 2 a 1 3 b 1 4 c 1 5 c 1 6 c 1 Cheers! -- View this message in context: http://r.789695.n4.nabble.com/reshape-data-adding-rows-to-dataframe-tp3253640p3254038.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.