Hello
I am trying to solve a relatively large stochastic mixed-integer nonlinear problem in GAMS using EMP and LINDO. The model runs successfully, and the solver is able to find the solution. But the problems is, I get the same answer for all the scenarios I have. I mean, when I use display command to see the values of my second stage (scenario-based) variables, I just see the same answers are repeated for s1*sn (scenario 1 to scenario n). I am not sure what’s wrong here. I do appreciate any comments!
Thanks!
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Probably you should add execseed=gmillisec(jnow) at the first line of your codes
Elcin
2013/11/22
Hello
I am trying to solve a relatively large stochastic mixed-integer nonlinear problem in GAMS using EMP and LINDO. The model runs successfully, and the solver is able to find the solution. But the problems is, I get the same answer for all the scenarios I have. I mean, when I use display command to see the values of my second stage (scenario-based) variables, I just see the same answers are repeated for s1*sn (scenario 1 to scenario n). I am not sure what’s wrong here. I do appreciate any comments!
Thanks!
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Hi,
There could be something in your model formulation forcing the same result for every scenario. However, without seeing the model it is hard to explain why you get the same results. It would help if you could send your model (or better a small example reproducing the problem).
Best regards,
Lutz
On 11/21/2013 5:23 PM, bansari@mymail.mines.edu wrote:
Hello
I am trying to solve a relatively large stochastic mixed-integer
nonlinear problem in GAMS using EMP and LINDO. The model runs
successfully, and the solver is able to find the solution. But the
problems is, I get the same answer for all the scenarios I have. I mean,
when I use display command to see the values of my second stage
(scenario-based) variables, I just see the same answers are repeated for
s1*sn (scenario 1 to scenario n). I am not sure what’s wrong here. I do
appreciate any comments!
Thanks!
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Lutz Westermann LWestermann@gams.com
GAMS Development Corporation GAMS Software GmbH
1217 Potomac St. NW, P.O. Box 40 59
Washington DC, 20007, USA 50216 Frechen, Germany
Fon/Fax: +1 202 342-0180/1 Fon/Fax: +49 221 949-9170/1
http://www.gams.com
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