[Couenne-tickets] [Couenne] #33: Counne says "tightened NLP is infeasible"

[Couenne]

#33: Counne says "tightened NLP is infeasible"
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  Reporter:  thofrei  |      Owner:  pbelotti
      Type:  defect   |     Status:  new
  Priority:  major    |  Milestone:
 Component:  Couenne  |    Version:
Resolution:           |   Keywords:  infeasible Couenne tightened NLP
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Comment (by thofrei):

 Hi Pietro

 Unfortunately, I don't have these files and since I am very new to all
 this I don't know how to get them. I changed a lot on the model in the
 mean time and don't get this specific error message anymore. But it's
 still the case that I get an optimal solution with ipopt, but couenne
 tells me that the problem is infeasible. The only difference in the
 couenne case is that I change two parameters to binary variables. So the
 solution should be reached if the variables get to the right values.
 Something strange that I realized is that with couenne I get errors such
 as "can't evaluate pow(0,0.5)" or /0 errors if I don't initialize the
 values although I specified the model as such that these cases shouldn't
 be possible. But as I said, the problem of infeasibility remains even if I
 make the initialization....

 Do you have an other idea, what I could try?

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Ticket URL: <https://projects.coin-or.org/Couenne/ticket/33#comment:4>
Couenne <https://projects.coin-or.org/Couenne>
Couenne, a solver for non-convex MINLP