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How to retrieve MIP Optimality Gap an Solving Time into a Parameter

rahmat
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Dear All,

Is possible to retrieve MIP optimalilty gap and Solving Time for each solve in to a parameter?

If so, how to do this?

Thank you very much.

Best answer by deannezhang

You can use the “Incumbent” and “Incumbent” suffix to retrieve the best known solution and the  LP bound, then use them to calculate the GAP and assign it to a parameter.

MpGap :=(abs(MathProgram.Incumbent - MathProgram.bestbound)/$abs(MathProgram.Incumbent)) * 100;

 

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deannezhang
AIMMS Champ
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You can use the “Incumbent” and “Incumbent” suffix to retrieve the best known solution and the  LP bound, then use them to calculate the GAP and assign it to a parameter.

MpGap :=(abs(MathProgram.Incumbent - MathProgram.bestbound)/$abs(MathProgram.Incumbent)) * 100;

 

Andrew
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  • Andrew
    Andrew
rahmat
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  • rahmat
  • Ace
  • January 6, 2020

Hello @deannezhang,

Thank you for the method to calculate the gap. For solving time, is there a way to retrieve it?

Thank you.

deannezhang
AIMMS Champ
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Yes, you can use the “SolutionTime” suffix. For other suffix and callback functions, you can refer to the AIMMS Language reference, part “Suffices and Callbacks”.

mohansx
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  • mohansx
    mohansx
rahmat
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  • rahmat
  • Ace
  • January 7, 2020

Hi @deannezhang,

Thanks a lot….

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