Hussein Sharadga

Hi Gurobi Community, I am solving a large MILP. Can the root relaxation result in a slightly different objective (1.2% difference) when formulating the problem in a different way? What I mean by fo...

Hello everyone, I'm currently working on solving a mixed-integer linear problem using Gurobi. The decision variables in this problem include both continuous and binary variables, with the binary va...

Hi Gurobi Community! I have a problem with about 83832 binary variables. What does it mean when gurobi uses the Presolve, and now the Presolve removes all binary variables? Does that mean the probl...

I have a large problem with binary variables. The binary variables sometime should be one. This is given by the lower bound on this binary variable. The normal condition: lower bound=0, upper bound...

Hi Gurobi Community! Suppose I have a limited time to solve a big MILP problem. Gurobi Consume 510 seconds to prove the optimality and then 200 seconds to find the solution using branch and bound a...

Does Guroib take advantage of the problem structure? I am working on a large optimization problem with more than 40,000 binary variables and huge number of constraints. below is only one of the con...

After I use the following command: m.computeIIS()m.write("m.ilp") how to figure out which constraint was the source of the problem? Please see the lip file below: I have a big model and I even do n...

Hi Gurobi Community. What is the difference between quadratic expression and quadratic constraint for gurobi? For quadratic constraint, I need to set the nonconvex parameter to 2 for gurobi to solv...

In the following code: x is constant, and B is the optimization variable. I have the following constraint.\[x<=sum(B)\]This constraint is the source of the problem.If I flip it as follows, the prob...

Hi! I tried to solve a problem with the following objective function: \[\min\  x^2-0.6x+M|x^2-x|\] \[0<=x<=1\] M=10import gurobipy as gpm=gp.Model()x=m.addVar(vtype='C',lb=0,ub=1)aux=m.addVar(vtype...