We also need an igraph_incidence (graph.incidence) function that creates a graph from an incidence matrix. Another function (igraph_get_incidence and get.incidence) should return the incidence matrix of a bipartite graph.
We also need an igraph_incidence (graph.incidence) function that creates a graph from an incidence matrix. get_incidence and get.incidence) should return the incidence matrix of a bipartite graph.
Another function (igraph_