Ahmed Azab

1. Community
2. Programming
3. MIP does not find any incubment solutions

Hi, Please try using the latest Gurobi version 11.0.3. Compared to the version you are using (9.1.2), there have been many more advanced features and more powerful techniques for QCP and MIQCP mode...

• View comment
• Ahmed Azab
• November 05, 2024 04:00
• Edited
• 1 vote

1. Community
2. Algorithms
3. Why Gurobi cannot find the solution to a simple Quadratic Optimization Problem?

Hi,I solved your model using Gurobi version 11.0.3.  Optimal solution found (tolerance 1.00e-04) Best objective 1.661528493733e-02, best bound 1.661528493733e-02, gap 0.0000% Note that the default ...

• View comment
• Ahmed Azab
• September 11, 2024 02:01
• Edited
• 0 votes

1. Community
2. Algorithms
3. How parameters work

Hi Khadija,Kindly refer to the Parameters section in the Gurobi references manual to learn more about these parameters.Best Regards,-Ahmed

• View comment
• Ahmed Azab
• September 05, 2024 04:51
• Edited
• 0 votes

1. Community
2. Modeling
3. ML+MO

Hi Jai, In addition to the previous explanation, I recommend reviewing the following examples from the Gurobi Machine Learning documentation: https://gurobi-machinelearning.readthedocs.io/en/stable...

• View comment
• Ahmed Azab
• September 03, 2024 08:09
• Edited
• 0 votes

1. Community
2. Algorithms
3. How to sum variables that are not dimensionally incomplete

Hi 子龙 王, The problem you're encountering occurs because your code is trying to find certain keys in the x dictionary that actually don't exist, resulting in a KeyError. This issue pops up due to th...

• View comment
• Ahmed Azab
• March 07, 2024 06:55
• Edited
• 0 votes

1. Community
2. Modeling
3. how to write code in GURBI MATLAB API for the constraint which is having expression in the right hand side .

You can rearrange the equality so that all variables are on the LHS, and the RHS value is zero: X = Y - Z to be  X - Y + Z = 0 I am not familiar enough with the Matlab API to provide a specific im...

• View comment
• Ahmed Azab
• March 07, 2024 00:38
• Edited
• 0 votes

1. Community
2. Modeling
3. how to write code in GURBI MATLAB API for the constraint which is having expression in the right hand side .

Hi AMIT, Please refer to the Gurobi reference manual for a better understanding of using Gurobi with MATLAB. Here, you will find MATLAB API Overview.Here, you will find more MATLAB Examples. - Ahmed  

• View comment
• Ahmed Azab
• March 06, 2024 10:36
• 0 votes

1. Community
2. Programming
3. solution file and rew as input

Hi Matthew, The following Python code can also do what you are looking for. import gurobipy as gpm1 = gp.read("test.mps")m1.read("test.sol")m1.params.SolutionLimit=1m1.optimize()m1.write("test.rew"...

• View comment
• Ahmed Azab
• March 05, 2024 02:00
• 0 votes

1. Community
2. Algorithms
3. Add a new constraint to the model

The reasons for the errors you have in constraint 4 are as follows: # constraint(4)  idea1 quicksum(D[p*x[i, j - 1, p]][q*x[i, j, q]] TypeError: list indices must be integers or slices, not gurobi...

• View comment
• Ahmed Azab
• March 01, 2024 03:24
• 0 votes

1. Community
2. Algorithms
3. Add a new constraint to the model

Hi 子龙 王, Please provide values for the model input Data. A small instance with some comments is better. Thanks - Ahmed

• View comment
• Ahmed Azab
• February 29, 2024 07:43
• 1 vote