> I'll post a followup to this thread when I will have found the
> cause :-)
I re-read thirty times the code and even tried to debug the LP solver
themselves. It went easier when I had the smart idea to read what was
written and not what I intended to write. The line :
p.add_constraint(v[x] + b[x][y] - v[y], min=0, max=0)
Should be :
p.add_constraint(v[x] + b[x][y] - v[y], min=0)
I'm posting a patch for this : http://trac.sagemath.org/sage_trac/ticket/9852
In the meantime, you can use the patch I mentionned previously to get
accurate answers. It will also be faster.
Thank you very much for reporting this bug ! :-)
Nathann
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