Originally posted by: SystemAdmin

[stefan_s said:]

    261         IloModel model(env);
    262         populate_problem(data1, model, true, true, true);                                                     
    263         solve_problem(model);                                                                                 
    264         IloModel model1(env);
    265         populate_problem(data1, model1, false, true, true);                                                   
    266         solve_problem(model1);

Every time I need to solve a problem, I'm creating a completely new model... maybe there is a way to destroy data in the previous model, and just repopulate it?

Thank you

PS. using concert, c++
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

[prubin said:]

If a variable is carried over from one model to the next with changes to its bounds, you can just invoke the setBounds method to make the changes.  If a constraint is carried over with changes to its bounds, the same holds.  If you are changing one or two coefficients in a constraint (or the objective function), there are methods you can use for that (such as IloRange::setLinearCoefs).  For wholesale changes to a constraint or objective, the corresponding setExpr method may be easier (just redo the whole expression).  Finally, to get rid of a variable or constraint that has outlived its usefulness, you can invoke the end() method on it.  All these methods communicate the changes to the owning model automatically.

/Paul
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

[stefan_s said:]

Thanks Paul, it is much clearer to me now.
In my specific case I decided not to change anything because at any given time I don't know exactly which constraints and variables are in the model, so its hard to write the code to remove and add the correct ones.

Thank again,
Stefan
#CPLEXOptimizers
#DecisionOptimization