Search found 5 matches
- 3 months ago
- Forum: Solvers
- Topic: BARON is taking a long time to solve the NLP model
- Replies: 0
- Views: 3164
BARON is taking a long time to solve the NLP model
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...
- 3 months ago
- Forum: Solvers
- Topic: BARON solver cannot handle the "Sign" function
- Replies: 2
- Views: 3833
Re: BARON solver cannot handle the "Sign" function
Thank you, Michael! This is very helpful.
Doris
Doris
- 3 months ago
- Forum: Solvers
- Topic: BARON solver cannot handle the "Sign" function
- Replies: 2
- Views: 3833
BARON solver cannot handle the "Sign" function
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...
- 4 months ago
- Forum: Solvers
- Topic: Issue of dual from energy/reserves balance constraint in optimization model
- Replies: 2
- Views: 13202
Re: Issue of dual from energy/reserves balance constraint in optimization model
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...
- 4 months ago
- Forum: Solvers
- Topic: Issue of dual from energy/reserves balance constraint in optimization model
- Replies: 2
- Views: 13202
Issue of dual from energy/reserves balance constraint in optimization model
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...