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## [igraph] Negative vertex id in random graph generator

**From**: |
Richard Geddes |

**Subject**: |
[igraph] Negative vertex id in random graph generator |

**Date**: |
Sat, 08 Dec 2007 23:52:18 -0500 |

**User-agent**: |
Thunderbird 2.0.0.6 (X11/20071022) |

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

**[igraph] Negative vertex id in random graph generator**,
*Richard Geddes* **<=**