Hi all, A couple of ideas for improving seq_along:
* It would be really useful to have a second argument dim: seq_along(mtcars, 1) seq_along(mtcars, 2) # equivalent to seq_len(dim(mtcars)[1]) seq_len(dim(mtcars)[2]) I often find myself wanting to iterate over the rows or column of a data frame, and there isn't a particularly nice idiom if you want to avoid problems with zeros - you have to use seq_len(nrow(df)) etc * To me, it would seem be very natural to have a rep_along function: rep_along <- function(x, y) rep(x, length.out = length(y)) possibly with more checking for the case where the lengths aren't integer multiples. I'd be happy to submit proposed implementations/documentation if there was interest. Hadley -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel