GAMS World Forum

Hi, I'm not super familiar with how CPLEX works, but Im also using CPLEX to solve my large-scap MIP problem. It is taking several hours to run. How do you tune the solver options to be near-optimal? How do you determine that its near-optimal? Hello GAMS experts! I'm working on solving a sequence of ...

Tried to modify the GAMS code so I can save the log and lst files (log file for now...). LocationAllocationModelv9_ColdStart.gms is the GAMS file name. I previously define a new parameter called 'instance' instance /456/ ..... ..... Model TestModel /all/; Option reslim=100; Option optCR=0.001; Optio...

Hi Michael, thanks for replying! When you mean to share an instance, do you mean to share the entire GAMS script here? I'm still getting used to the GAMS syntax. Is it possible to name the file based on a given parameter? For example, say we set the parameter 'instance'=6. When the log or lst file i...

I've tried contacting BARON with specific questions about my nonlinear/non-convex model but didn't get a favorable reply. Because my BARON license is through GAMS, I was told to contact GAMS first. GAMS will contact them if they have any questions. :( So I just stopped there.. In GAMS, solver option...

Hi everyone,

It is possible to define a termination criteria wherein the solver will terminate when a solution cannot be found after a specified amount of time?

Neither the user and solver manuals talk about this.

Any help is greatly appreciated!

Hi everyone, As Im reading more into what BARON does, the solver manual talks about how BARON does a local search in its preprocessing phase. It states that BARON decides the number of local search in preprocessing based on problem and NLP solver characteristics. First, how do i specify the numLoc s...

Hi everyone, I created a model that is nonlinear and nonconvex through the BARON solver with optcr=0.001. Im exploring different parameter combination instances through MATLAB which then calls my GAMS script (that contains the NLP/nonconvex model) to solve the model. Once the optimal solution or a f...