Questions tagged [cplex]

Questions related to the commercial solver IBM ILOG CPLEX Optimization Studio.

7 questions with no upvoted or accepted answers
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Cplex is stuck after root node relaxation solution

I am solving an MIP through Benders decomposition (coded both generic and legacy callback versions), by employing Java with Cplex 12.9. For some of the instances, Cplex is stuck for two hours (time ...
5
votes
0answers
100 views

Obtaining the system of irredundant inequalities from a set of inequalities using CPLEX

Given a linear system of inequalities $Ax \geq b$, I would ideally like to compute the irredundant set for those set of inequalities. I know how to do so mathematically, but I was wondering if there ...
2
votes
0answers
47 views

how to convert type of variable in CPLEX

I have an Integer Linear Problem which is solved quickly when I change my variable type to double. now I'm developing a fix and relax algorithm and I used conversion to change data type which takes a ...
1
vote
0answers
26 views

Bioinformatics / Genomics Optimization Problems?

I am a third year bioinformatics student and would like to apply my knowledge from an introductory course in Optimization Methods to some problems in the field of genomics or bioinformatics. Do you ...
1
vote
0answers
47 views

Making distinct modifications on a model

How can I apply different modifications separately on a model? The example in CPLEX documentation shows how to make modifications on a single solved model. However, unlike this example, I want to make ...
1
vote
0answers
43 views

CPLEX keeps restarting in Pyomo

I tried running my model by adding the following settings to CPLEX. ...
1
vote
0answers
66 views

Ways to improve lower bounds while solving MIPs

What are the ways to improve lower bounds while solving a minimization problem (MILP)?