How can I write objective function with variable plus constant for solving using intlinprog Ex. X1+4

2017 9 16
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更新时间：2017 11 15
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How can I write objective function with variable plus constant for solving using intlinprog Ex. X1+4
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Matt J
Matt J 2017-9-16
编辑：Matt J 2017-9-16

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There is no way to include a constant term in the objective function, but it would be meaningless to do so. Adding a constant term does not change the optimal solution, x.

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Nurye Hassen
Nurye Hassen 2017-9-17
The original question is to minimize delay of trains, meaning actual arrival time minus scheduled arrival time. I considered the controlled variable to be actual arrival time and scheduled time table as a constant. Also, Is it acceptable to replace the constant with the variable in the objective and then include it in equality constraint like this.. obj X1+4 ==>x1+x2 Include x2=4; In constraints
Thank you again.
Matt J
Matt J 2017-10-7
编辑：Matt J 2017-10-7
Again, that would complicate things unnecessarily. Using your example of obj X1+4, note that
min{X1+4} = min{X1}+4
In other words, you could just solve the minimization min{X1} without any constant terms and then add 4 to the final result.

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Aurele Turnes
Aurele Turnes 2017-11-13
编辑：Aurele Turnes 2017-11-13

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If you have R2017b, the new Problem-based approach lets you specify constant terms in the objective of linear and mixed-integer linear problems. Although Matt is correct that the constant term will not change the final solution value, just the objective value.

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