Iason Liagkas
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Latest activity by Iason Liagkas
Iason Liagkas created a post,
large matrix coefficient meaning
AnsweredHello guys, What does a large matrix coefficient cause to our problem? can we say that the results will be very sensitive to coefficient values? what would be the consequences of this situation? Ki...

Iason Liagkas created a post,
obtain variable values from a program inside a function
AnsweredHello guys, I have created a function named SP_define and inside I have formed an optimization model named SPmodel = gp.Model('SP'). On the final line of the function, I have written: return SPmode...

Iason Liagkas commented,
Thanks Jaromił

Iason Liagkas commented,
Thanks Mario, this example works. Kind regardsIason

Iason Liagkas commented,
From what I see on the General Constraints page A dynamic piecewiselinear approximation, using outer approximation and spatial branchandbound. In this approach, the MIP solver is extended to c...

Iason Liagkas commented,
Hello Jaromił, Do you know how can I approximate linearly piecewise the logarithm in Gurobi 11 without creating integer variables? What would be the functions I would have to use? Kind regardsIason

Iason Liagkas commented,
Mario will the execution of the code be slower with my method? Do you have any handy example of how to use SPmodel.chgCoeff()? Kind regardsIason

Iason Liagkas commented,
Hello Mario, what worked for me is to make a function that forms my LP model, and each time I want to update a parameter I call the function so the problem is formed again. My function includes the...

Iason Liagkas commented,
Thank you Eli, that was the problem, enjoy your holidays! Kind regardsIason

Iason Liagkas created a post,
Getting the dual variable values when the model status is 4(INF_OR_UNBD)
AnsweredHello guys, I am running the benders algo, When my subproblem is feasible I am using the following line to get the dual variable value: gp.quicksum(BigM*deltars2kE[r,s,k]*subproblem.getConstrByNam...