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Bastiaan Devilee

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IRP subtour constraints in OPL

Posted By Bastiaan Devilee Mon May 03, 2021 10:30 AM
Found In Library: Decision Optimization
#DecisionOptimization

IRP subtour constraints in OPL

Posted By Bastiaan Devilee Mon May 03, 2021 10:30 AM
Found In Egroup: Decision Optimization \ view thread
Hi, I'm new to this platform. Can someone tell me how to model subtour elimination constraints for a MILP in OPL CPLEX for a multi-vehicle IRP? See my code attached. There are no errors in the code so far, but I know that the subtour constraints are not correct yet. See below the mathematical model. ...

RE: Re: CPLEX(default) cannot extract expression

Posted By Bastiaan Devilee Wed April 28, 2021 11:33 AM
Found In Egroup: Decision Optimization \ view thread
hi, I have a lot of error messages that read: "CPLEX(default) cannot extract expression". Can someone maybe help me with this? If I add using CP; than the number of errors goes from 30 to 20. I want to optimize a single vehicle IRP ((Bertazzi & Speranza, 2013) Best Regards ------------------------------ ...

RE: Re: CPLEX(default) cannot extract expression

Posted By Bastiaan Devilee Wed April 28, 2021 05:53 AM
Found In Library: Decision Optimization
#DecisionOptimization