Originally posted by: SystemAdmin

[namsu said:]

Dear all

I'm using concert in cplex 11.

I want to name a certain constraint and,
I need to solve two cases.
First one is without a constraint, and the other one is with a constraint.

That is, in c++, how can I remove/add a constraint?

thanks.


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Originally posted by: SystemAdmin

[Jenny said:]

Maybe you can write two models, one with the constraint and one without, and then use cplex to solve them seperately.



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Originally posted by: SystemAdmin

[prubin said:]

[quote author=namsu link=topic=393.msg1121#msg1121 date=1215760523]
That is, in c++, how can I remove/add a constraint?


1.  IloModel::remove() deletes the constraint (IloRange) from the model but does not destroy the IloRange object.

2.  IloRange::end() removes the constraint from any models containing it and then destroys it (frees up its memory).

3.  IloRange::setLB() and/or IloRange::setUB() can be used to make the constraint vacuous (e.g., change x + y <= 5 to x + y <= infinity but leave it in the model).<br />
/Paul

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