[igraph] closeness syntax?

[Yong Zou]

Hi Tamas,

What is the correct setting for *weights? My previous code doesn't
work properly.
igraph_closeness(&graph, &res, igraph_vss_all(), IGRAPH_ALL, ??);

int igraph_closeness(const igraph_t *graph, igraph_vector_t *res,
                     const igraph_vs_t vids, igraph_neimode_t mode,
                     const igraph_vector_t *weights);

Thanks very much.
Yong