Originally posted by: RainLee

Hi,all
I want to make a model which include two class constraints,one is solid,it is the same in every iteration,the remaining constraints is changed in iteration. My question is:
1.how to identify and delete the changed constraints?
2.how to add the new constraints in a structued model in iteration?

wishes for your help,thanks in advance!
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Originally posted by: SystemAdmin

What API are you using? Doing what you want is rather easy but depends on the API being used.
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Originally posted by: RainLee

I use concert technology for c++ users, wish for your help.
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Originally posted by: SystemAdmin

Use IloModel::add() and IloModel::remove():

IloEnv env; IloModel model(env);   
// add the permanent constraints model.add(IloRange(env, ...)); ...   
// Create instance of IloCplex that solves model. IloCplex cplex(model);   
// Now loop and use additional temporary constraints in each loop. 

for (

int i = 0; i < ???; ++i) 
{ 
// Create an array of temporary constraints. IloExtractableArray temporary(env); temporary.add(IloRange(env, ...)); 
// Create one temporary constraint temporary.add(IloRange(env, ...)); 
// Create another temporary constraint   
// Add temporary constraints to model. This will notify the IloCplex instance about the new constraints. model.add(temporary);   
// Solve the problem. cplex.solve();   
// Handle solution. ...   
// Remove temporary constraints (will notify IloCplex instance) and delete them. model.remove(temporary); temporary.endElements(); temporary.end(); 
}

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Originally posted by: RainLee

Daniel Junglas,
thanks a lot for your help,that's just the answer.
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