Hussein Sharadga
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Activity overview
Latest activity by Hussein Sharadga-
Hussein Sharadga created a post,
Root relaxation solution
AnsweredHi 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...
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Hussein Sharadga commented,
This one now works! Thank you Jaromił Najman def mycallback(model, where): if where == GRB.Callback.MESSAGE: if 'Variable types' in m.cbGet(GRB.Callback.MSG_STRING): ...
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Hussein Sharadga created a post,
How to terminate gurobi solver?
AnsweredHello 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...
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Hussein Sharadga commented,
Dear Dr. Jaromił Najman Thank you so much. Hussein
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Hussein Sharadga created a post,
Presolve is successful in removing all binary variables
AnsweredHi 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...
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Hussein Sharadga created a post,
lower bounds of variables given by iterating over dictionary instead of matrix
AnsweredI 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...
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Hussein Sharadga created a post,
Optimality proof when limited computation time
AnsweredHi 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...
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Hussein Sharadga created a post,
Does Gurobi take advantage of the problem structure?
AnsweredDoes 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...
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Hussein Sharadga created a post,
How to use computeIIS to find the constraint or the bound that is the source of the infeasibility?
AnsweredAfter 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...
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Hussein Sharadga commented,
Thank you so much! Mario Ruthmair You are right. In my second case, the constraint was not added to the model. Best, Hussein