[igraph] Question on igraph_community_fastgreedy

[Richard Geddes]

Hello,

I'm interested in using the igraph_community_fastgreedy function:

int igraph_community_fastgreedy(const igraph_t *graph,
  const igraph_vector_t *weights,
  igraph_matrix_t *merges, igraph_vector_t *modularity);

in a c++ program, and I see only 3 of the 4 function arguments described in the documentation.  In particular, the

const igraph_vector_t *weights

argument has no description... are these the weights described as the heuristics in the Wakita paper? 

Also, if I'm not interested in weights, can I use NULL?

Thanks
Richard