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? Shouldn’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 it’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, shouldn’t there be
an earlier sign?
Thanks!
-Marco
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