Crispin - This is a familiar problem. The only way I know of to do it is:
result <- lapply(seq(along=list.a), function(i,a,b) do.it(a[[i]], b[[i]]), list.a, list.b) Here, do.it() is the function which operates on two elements. I use this construction frequently. - tom blackwell - u michigan medical school - ann arbor - On Mon, 6 Oct 2003, Crispin Miller wrote: > I need to take two lists-of-lists, and apply a function to each > pair of elements in the lists to return a single list... > For example > > l1 <- list(1:5,6:10,2:15) > l2 <- list(1:8,4:12,1:19,4:20) > > I could easily do an lapply across each of them, but is there a > function that does a sort-of pairwise-apply across both together? > > Does anybody know of a good document that discusses this kind of > basic matrix/list/vector manipulation in R? > Regards, > crispin ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
