Dear R-Helpers, I have a list l1 like: l1[[1]] a b c
l1[[2]] d l1[[3]] e f I want an output res like: res[[1]] 1 1 1 res[[2]] 2 res[[3]] 3 3 Essentially, I want to replicate each index equal to the number of elements present in that index. Below is what I do to accomplish this: l1 <- list(c("a", "b", "c"), "d", c("e", "f")) res <- mapply(rep, seq_along(l1),times=(lapply(l1, length))) Is there a more elegant way of doing this (possibly using one (l/m)apply function)? Thanks in advance for the help. Best Regards, S. [[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.