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

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Nurye Hassen 2017-9-16

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评论： Nurye Hassen 2017-11-15

采纳的回答： Matt J

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

Thank you for your time

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Answer 1

Matt J 2017-9-16

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编辑：Matt J 2017-9-16

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 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 2017-10-7

编辑：Matt J 2017-10-7

在 MATLAB Online 中打开

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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Answer 2

Aurele Turnes 2017-11-13

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编辑：Aurele Turnes 2017-11-13

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.