I am brand new to using igraph, and relatively new to R, so please bear with me if my question is a simple one. I am building a graph using the example given in the "Real world examples" of the igraph introductory material. I have been successful so far in creating the graph, adding vertices, and creating a matrix of edges. However, when it comes to adding the edges to the graph, I get an error message:
> g2005 <- add.edges(g2005, t(edges2005)) Error in add.edges(g2005, t(edges2005)) : At type_indexededgelist.c:240 : cannot add edges, Invalid vertex id
I'm not sure what this means. I have tried looking at the vertex list and the edge list and can't seem to find a problem with either. Any ideas? Any workarounds?
Thank you very much! Alisa
-- Alisa Coffin, PhD. Candidate Department of Geography University of Florida Gainesville, FL 32611