I see .Thanks a lot for quick reply. best, /Shahab
On Fri, Mar 15, 2013 at 8:12 PM, Tamás Nepusz <[email protected]> wrote: >> I face strange problem with vcount(). I tried to get the number of >> nodes form an edge list graph (see attachment). >> Using vcount() it returns 502 but in fact it is 262 nodes ??? > No, it has 502 nodes since there is an edge from vertex 35 to vertex 501 > according to the file, and the nodes are indexed from zero upwards in an > edgelist file. So, if the highest node ID is 501 in your file, it means that > it has 502 nodes. Of course it may happen that lots of your nodes have no > attached edges. > > If your numeric IDs are not continuous, you may want to read the file using > the NCOL format instead of edgelist. In this case, igraph will treat the > numbers in the file as symbolic names and it will attach them to the "name" > vertex attribute. However, in this case, the nodes will be ordered > arbitrarily and you will have to look up the appropriate indices based on the > "name" vertex attribute. > > -- > T. > _______________________________________________ > 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
