Hi,

I am looping three completely equal problems. Every iteration shows

the same behavior for all three problems until in iteration 10 the

dual value in one of the problems deviates by -2.22E-16 and changes

the outcome for this one problem, while the other two behave exactly

equal. Has anybody an idea how this is possible? And more importantly,

what I can do to fix it?

Thanks a lot!

Marco

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Hello again,

Actually, I just saw that the total costs for both solutions are the

same. The one problem chooses to have higher fixed costs and lower

variable costs, while the other does the opposite with the same

overall costs. What does GAMS usually do if two solutions are equally

expensive? Shouldnâ€™t it be at least consistent?

I would really appreciate comments!

Thanks!

Marco

On 28 Apr., 22:12, Marco wrote:

Hi,

I am looping three completely equal problems. Every iteration shows

the same behavior for all three problems until in iteration 10 the

dual value in one of the problems deviates by -2.22E-16 and changes

the outcome for this one problem, while the other two behave exactly

equal. Has anybody an idea how this is possible? And more importantly,

what I can do to fix it?

Thanks a lot!

Marco–

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Ok itâ€™s me again.

Now, I have more straight forward question (based on the two posting

above). In the 9th iteration, one variable deviates in the 10th

decimal. Before that, all values are exactly equal. Is it even

possible that this is an error in the code? If so, shouldnâ€™t there be

an earlier sign?

Thanks!

-Marco

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