As I discovered on CoCalc running Sage 9.1, it appears that any attempt to
use nauty/genbg to build bipartite/hyper-/di- graphs with more than 32
total vertices fails silently.
Please compare the results of:
---------
L=list(hypergraphs.nauty(13, 13, uniform=2, regular=2,max_intersection=1))
for i in L:
print i
print "done"
---------
L=list(hypergraphs.nauty(17, 17, uniform=2, regular=2,max_intersection=1))
for i in L:
print i
print "done"
---------
CoCalc support confirmed the behavior, and suggested the issue was in Sage,
referring me (through the FAQ) to address it here.
I believe there's a nauty compiler option that defaults to 32-bit words but
can be set to use 64-bit .... WORDSIZE? Shouldn't happen often, but even
then would probably be best to give an error for going over 64 vertices.
Thanks!
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