GAMS World Forum

Hi The only equation in the model used with a division is: augm_obj.. sum(o1,dir(o1)*b(o1)) + 1e-3*sum(om1,sl(om1)/(maxobj(om1) - minobj(om1))) =e= a_objval; so, it looks like the difference between maxobj(om1) and minobj(om1) gets zero for a certain or all om1. You could rewrite the equation by add...

Hi Vahdi

You will find the answer in the first example of the GDXXRW documentation.

Cheers
Renger

Hi
Conopt4, as far as I can see in the documentation, came with GAMS version 25.1. Perhaps you have an older version of GAMS.
Just try 'option nlp=conopt;' (assuming you are trying to solve an NLP problem).

CHeers
Renger

It sounds a little bit weird but perhaps https://www-01.ibm.com/support/docview. ... wg21399979 can explain it.
Cheers
Renger

You can find the option scanind in the documentation on CPLEX (https://www.gams.com/latest/docs/S_CPLEX.html). If you don't want matrix scaling the value should be -1.
Cheers
Renger

Hi You haven't checked your SAM. The SAM shows imbalances parameter checkrow(v), checkcol(u), checkbal(u); checkrow(u) = sum(v, sam(v,u)); checkcol(v) = sum(u, sam(v,u)); checkbal(u) = checkcol(u) - checkrow(u); display checkbal; shows this: ---- 42 PARAMETER checkbal AGRI 0.004, MANU -0.010, SERV -...

Hi Monireh
Could you attach the code, so I could test it on my computer?
Cheers
Renger

Hi You could try to use the techniques of Tom Rutherford for decomposing the model into a detailed household part and an economic model with one aggregated household. He used this technique to do an analysis for Russia with 55'000 households as described in Rutherford, Tarr, and Shepotylo (2008) htt...

Hi
Your question is posed in a such a general way, that it is hard to give an answer.
What kind of model (where is the code), what is meant by "different"?
Cheers
Renger

Hi
It would be helpful if you post the code that causes the errors. This would make it easier to point to the errors you are making.
Cheers
Renger