Strange values in binary variables

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jasondiavatis
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Strange values in binary variables

Postby jasondiavatis » 8 months ago

Hi,
I've constructed a pretty large MINLP concerning routing optimisation. I managed to solve it with BARON solver. The problem is that some of the binary variables are assigned with no binary values, for instance 1.000e-07. Any ideas why this is happening? Thanks

J D

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bussieck
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Re: Strange values in binary variables

Postby bussieck » 8 months ago

BARON's default for integer feasibility is (like many B&C solvers) at 1e-5. See the BARON documentation for the option AbsIntFeasTol (https://www.gams.com/latest/docs/solver ... ermination). The smallest you can make this number is 1e-12. So you still might get results with some noise, but this will be < 1e-12. The RelIntFeasTol is already at 0.

-Michael

jasondiavatis
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Re: Strange values in binary variables

Postby jasondiavatis » 8 months ago

bussieck wrote:BARON's default for integer feasibility is (like many B&C solvers) at 1e-5. See the BARON documentation for the option AbsIntFeasTol (https://www.gams.com/latest/docs/solver ... ermination). The smallest you can make this number is 1e-12. So you still might get results with some noise, but this will be < 1e-12. The RelIntFeasTol is already at 0.

-Michael
Thanks Michael. Your comment was very helpful.


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