make_fromids is deprecated and will be removed in a future release.
Use make_index_ids with mode = "from" instead.
make_fromids(index_ids, return_list = FALSE, upmain = NULL)list containing a "froms" matrix, "lengths" vector, and optionally "froms_list" elements.
data.frame as returned by make_index_ids
logical if TRUE, the returned list will include a "froms_list" element containing all from ids in a list form.
data.frame containing id and upmain columns. upmain should
be a logical value indicating if the id is the upmain connection from its
downstream neighbors.