Search found 7 matches
- 5 months ago
- Forum: Modeling
- Topic: Tuning CPLEX solver options for large-scale MIP problems
- Replies: 4
- Views: 16331
Re: Tuning CPLEX solver options for large-scale MIP problems
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 ...
- 10 months ago
- Forum: Solvers
- Topic: Saving Time of when best solution was found & log and lst files with unique names
- Replies: 3
- Views: 6470
Re: Saving Time of when best solution was found & log and lst files with unique names
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...
- 10 months ago
- Forum: Solvers
- Topic: Saving Time of when best solution was found & log and lst files with unique names
- Replies: 3
- Views: 6470
Re: Saving Time of when best solution was found & log and lst files with unique names
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...
- 10 months ago
- Forum: Solvers
- Topic: BARON numLoc & local search preprocessing
- Replies: 2
- Views: 5957
Re: BARON numLoc & local search preprocessing
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...
- 10 months ago
- Forum: Solvers
- Topic: BARON: terminates solver when solution does not improve after x amount of time
- Replies: 1
- Views: 5654
BARON: terminates solver when solution does not improve after x amount of time
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!
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!
- 10 months ago
- Forum: Solvers
- Topic: BARON numLoc & local search preprocessing
- Replies: 2
- Views: 5957
BARON numLoc & local search preprocessing
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...
- 10 months ago
- Forum: Solvers
- Topic: Saving Time of when best solution was found & log and lst files with unique names
- Replies: 3
- Views: 6470
Saving Time of when best solution was found & log and lst files with unique names
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...