[igraph] Negative vertex id in random graph generator

[Richard Geddes]

Hello,

I've been generating some random graphs with the following:

igraph_erdos_renyi_game(&graph, IGRAPH_ERDOS_RENYI_GNP, n, 10.0/n,
IGRAPH_UNDIRECTED, IGRAPH_NO_LOOPS);

I tried n = 100, 500, 1000, 5000, 10000   and everything look good.

However, when I tried n = 50000, 100000 I got the following output:
---
Error at structure_generators.c:74 :Invalid (negative) vertex id,
Invalid vertex id
Aborted (core dumped)
---

Is this a bug?

Thanks
Richard