Originally posted by: SystemAdmin

[e129377 said:]

[i]Hi,

I am solving two different model consecutively. According to the solution of the first model, I need to fix some of the decision variables to a constant in the second model. To save execution time I don't want to add constraint as X[i][j]=1.[i] I am sure but I may need to convert a decision variable to a parameter.[/i] Do you have any idea?

Thanks in advance.  [/i]
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Originally posted by: SystemAdmin

[amarO said:]

If you are using CPLEX callable libraries, I would suggest CPXchgbds which will simply fix the variables to whatever value you want in the variable declaration section. If there is any faster way to do it, I would be glad to know it.

I hope this will help.

Amar
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

[e129377 said:]

I have tried both changing the boundries, as Amar suggested, and adding cuts (not constraints). In both case, execution time is the same. Thanks Amar.

Guvenc
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