This happens if you mix zeros with vertex ids, or maybe NAs. Why it happens to you I have no clue.
Unless you show us how to reproduce the bug with some reproducible example, there is a high chance that nobody can help you. Best, Gabor On Mon, Nov 11, 2013 at 6:13 PM, <[email protected]> wrote: > I have a bipartite graph of an online forum. The vertices id are the user id > (e.g. "24242434") and url links (e.g. "www.somesite.com/somethread.html). I > successfully create the graph with > > graph.data.frame(edges, directed=TRUE, vertices=nodes) > > IGRAPH DN-B 154612 448387 -- > + attr: name (v/c), gender (v/c), member (v/l), timestamp (v/c), type > (v/l), reactions (v/n), dislikes (v/n), createdAt (v/c), slug (v/c), > postNumber (v/n), likes (v/n), message (v/c), score (v/n), > categoryLink (v/c), createdAt (e/c), type (e/c), parent (e/c), > dislikes (e/n), message (e/c), numReports (e/n), likes (e/n) > > Now I want a one-mode projection of the graph. But when I try > >> igraph_onemode <- bipartite.projection(igraph_bi) > > > I get > > Error in bipartite.projection(igraph_bi) : > At structure_generators.c:84 : Invalid (negative) vertex id, Invalid > vertex id > > This error popped up few times when googling it. Still the discussions I > found (I guess) don't apply to my problem since I can't remove the negative > ids. > > Thanks > > > > _______________________________________________ > igraph-help mailing list > [email protected] > https://lists.nongnu.org/mailman/listinfo/igraph-help _______________________________________________ igraph-help mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/igraph-help
