Originally posted by: waldstein

Hi everybody,

when I used c# to call cplex solver, I encountered a situation: when I called cplex for too many times, it returns an error named "no solution exists" and the algorithm terminated.

My quesiton is: if cplex can not find a feasible solution, why doesn't it return a status "infeasible", which could be obtained by Cplex.GetStatus()?

thanks!

PS: I do not know whether it is a result of calling cplex solver too many times. It is just a phenomenon...
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Originally posted by: SystemAdmin

What is the status you see in this case?
Note that Cplex.Solve() returns true if a feasible solution is available and false otherwise. This may be all you need?
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#DecisionOptimization

Originally posted by: waldstein

Daniel,

thanks.

my code is written as follows:

try
{
if(cplex.Solve())
{
}
else
{
}
}
catch
{
}

if the model is infeasible, I thought the code would go to "else". But actually it went to "catch"...

Would you please help me on that?
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#DecisionOptimization

Originally posted by: SystemAdmin

That means that an error occurred during the solve. What is the message of the exception you get? That should give a hint about what went wrong.
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#DecisionOptimization

Originally posted by: waldstein

I changed the branching rule and this situation no longer appears....
Let me try to explore it and paste the relating message :)
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#DecisionOptimization