[igraph] dyad_census() does not hold large graph

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Hi all,

I'm using igraph in python.

I have a graph with 50309 nodes and 332582 edges.

when I call dyad_census(), it returns: 44684 mutual, 243214 asymmetric, -882298960 null dyads

as you can see, the number for null is a negative.

Of course, I can calculate it by (50309*50308-2*44684-2*243214)/2=1265184688.

I just present this case I encount.

for smaller graph, it works well.

I think it's just because the number becomes too large, so that it overflows.

isn't held by a 64-bit integer, then?

Thanks.

Gang