Maliheh Aramon

1. Community
2. Programming
3. Get variables by name

Hi Sophie,  You need to use the method Model.cbGetSolution(vars) to retrieve values from a new MIP solution. There is a clear example of how to do this at the bottom of the documentation page linke...

• View comment
• Maliheh Aramon
• May 12, 2022 05:09
• 0 votes

1. Community
2. Algorithms
3. Change solution strategy to standard (ImproveStartGap,ImproveStartNodes,ImproveStartTime)

Hi Ilya,  The parameters ImproveStartGap, ImproveStartNodes, and ImproveStartTime trigger solution improvement strategies where the Gurobi Optimizer only focuses on improving the incumbent to find ...

• View comment
• Maliheh Aramon
• April 21, 2022 01:51
• 1 vote

1. Community
2. Programming
3. Parameter for defining a memory limit (as a stopping criteria, like a time limit)

Hi Masoud,   Thank you for your comments. The Gurobi MemLimit parameter is not just applicable to MIP problems. It is applicable to continuous problems too. For example, if the total amount of memo...

• View comment
• Maliheh Aramon
• April 21, 2022 01:21
• Edited
• 0 votes

1. Community
2. Programming
3. Find the variable values for different solutions by PoolSolutions

Hi Ahmad,  After setting the parameter SolutionNumber to the \(i\)-th best solution, the value of each variable can be accessed by querying the attribute Xn and not X (this attribute always reports...

• View comment
• Maliheh Aramon
• April 20, 2022 21:18
• 1 vote

1. Community
2. Programming
3. Generalizing exponential constraints

Hi Elina,  You can make your implementation cleaner and more compact like below: m.addConstrs((-b * t[i] == l[i] for i in range(num_work)), name="fatigue")for i in range(num_work): m.addGenCons...

• View comment
• Maliheh Aramon
• April 20, 2022 18:57
• 0 votes

1. Community
2. Modeling
3. Infeasible Model unbound Excel OpenSolver

Hi Adrian,  What are the coefficient values of variables \(x_i\) in your maximization model? Are they negative? The best way to figure out why your model is infeasible is to compute one of its IIS ...

• View comment
• Maliheh Aramon
• April 20, 2022 00:08
• 0 votes

1. Community
2. Programming
3. Parameter for defining a memory limit (as a stopping criteria, like a time limit)

Hi Masoud and Henrique,  Gurobi versions >=9.5.0 supports a new parameter called MemLimit which allows the user to limit the total amount of memory available to Gurobi. If the Gurobi Optimizer need...

• View comment
• Maliheh Aramon
• April 19, 2022 22:20
• 0 votes

1. Community
2. Modeling
3. Iterative/multi period optimization (dynamic)

Hi Maryam,  I am not sure that I fully understand the question. Could you please elaborate more on what the issue is? I would suggest posting a complete code snippet with all input such that we can...

• View comment
• Maliheh Aramon
• April 14, 2022 01:45
• 0 votes

1. Community
2. Modeling
3. How can I linearize a quadratic equation or constraint?

Hi Laura, The added equality quadratic constraints makes the problem nonconvex and you need to explicitly set the parameter NonConvex=2 to tell Gurobi that it needs to solve a nonconvex problem.  B...

• View comment
• Maliheh Aramon
• April 13, 2022 02:56
• 0 votes

1. Community
2. Programming
3. quadratic quotient programming

Hi Xiaoyu,  No, Gurobi does not directly support solving an optimization problem with an objective function in the form \(\frac{x^\prime Q x}{x^\prime P x}\). Please check the article on What types...

• View comment
• Maliheh Aramon
• April 13, 2022 02:47
• 0 votes