GAMS World Forum

Hi All, I am running a large NLP model using the global solver BARON. However, the process has been going on for 5 hours with 873,177 iterations, and no results have been reported. I would like to ask if I should interrupt the active process and let it report the best solution before the current sol...

Thank you, Michael! This is very helpful.

Doris

Hi All, I am running a DNLP model using the global solver BARON. The error message said the BARON cannot handle the "sign" function for one of my equations as attached. Could anyone help rewrite the equation by posing the following conditions: (1) if vpi(i)-vpi(j) >0, eweymouthp(aij(ap,i,j...

Hi Michael, Thank you very much for your quick response! I have now attached the GAMS code of the model. I would like to provide a description of the model and the problem I have encountered. Description: I am running a stochastic linear programming model that can be used for pricing in electrical e...

Hi All, I am co-optimizing the energy and reserves in a LP model using the CPLEX solver. However, the reserves price, the dual of the balance constraint, exceeds the bound of 1,500 but to 2,950 (this issue does not happen if I use the CONOPT4 solver). I would like to ask if there is a way that I can...