R: convert asymmetric list to matrix - number of elements in each sub-list differ

Question

I have an asymmetric list, i.e., the number of elements in each sub-list differ. How can I convert the list to a matrix?

Below I begin with a symmetric list and con

Answer 1

First, extend each vector in your list with NAs to get vectors of the same length. Then create your matrix. For example:

max.len <- max(sapply(my.list2, length))
corrected.list <- lapply(my.list2, function(x) {c(x, rep(NA, max.len - length(x)))})
mat <- do.call(rbind, corrected.list)