Originally posted by: SystemAdmin

[dant said:]

Hi,

I'm a complete newbie. I have ILOG OPL Development Studio IDE. How do I trace the source of the infeasibility if I get the following message?

Infeasibility row 'id91323':  0  = -10.

Any help is much appreciated.

Regards.
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Originally posted by: SystemAdmin

[achterberg said:]

I think that there should be an option to run the conflict refiner. This tool will provide a small subproblem of your model that is still infesaible. By looking at this subproblem you may be able to find the reason for the infeasibility. Sometimes, this is a modeling mistake, sometimes an error in the data, and sometimes it points to an issue in the real-world system that you are modeling.

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Originally posted by: SystemAdmin

[cplexuser said:]

Feasopt is another method to detect the infeasibility. It also suggests the minimum bounds/constraints that can be modified to make the problem feasible. It does not change the original problem though.

I have used it through concert/interactive optimizer and proved very useful. Please check if you have an option to use this.
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