Actually I don't fully understand this function.

The signature is:

int igraph_contract_vertices(igraph_t *graph,
    const igraph_vector_t *mapping,
    const igraph_attribute_combination_t *vertex_comb);

'graph' is the input graph.  Where is the new graph returned?

On 19 September 2016 at 15:17, Szabolcs Horvát <> wrote:
> Hello everyone,
> Quick question about contract_vertices():
> I don't have attributes.  Can I just pass vertex_comb=NULL?
> Szabolcs

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