Originally posted by: SystemAdmin

[shadi said:]

hi,
i have a column generation problem, in oder to find always atleast one duty for each trip i created i tupleset RelaxationParameters which has all the possibilities of my parameters.

  [b][i]var cpConfig = new IloOplRunConfiguration("btpair_no_preprocess.mod");   
        var cpModel = cpConfig.oplModel;
        cpConfig.cp.param.LogVerbosity="Quiet";
        cpModel.addDataSource(SettingData(cpData0,Opl.item(RelaxationParameters,RelaxationCounter).ctTripType,  Opl.item(RelaxationParameters,RelaxationCounter).ctCover, Opl.item(RelaxationParameters,RelaxationCounter).ctPayCredit, Opl.item(RelaxationParameters,RelaxationCounter).ctRotation, Opl.item(RelaxationParameters,RelaxationCounter).ctDepot, Opl.item(RelaxationParameters,RelaxationCounter).ctBusType, Opl.item(RelaxationParameters,RelaxationCounter).ctPauseTime, t, nSeq, Opl.item(RelaxationParameters,RelaxationCounter).minStop, Opl.item(RelaxationParameters,RelaxationCounter).maxStop, Opl.item(RelaxationParameters,RelaxationCounter).longStop, Opl.item(RelaxationParameters,RelaxationCounter).PayCreditLevel));
        cpModel.generate();
       
       
       
while (cpConfig.cp.solve()==false){

    cpModel.addDataSource(SettingData(cpData0,Opl.item(RelaxationParameters,RelaxationCounter).ctTripType, Opl.item(RelaxationParameters,RelaxationCounter).ctCover, Opl.item(RelaxationParameters,RelaxationCounter).ctPayCredit, Opl.item(RelaxationParameters,RelaxationCounter).ctRotation, Opl.item(RelaxationParameters,RelaxationCounter).ctDepot, Opl.item(RelaxationParameters,RelaxationCounter).ctBusType, Opl.item(RelaxationParameters,RelaxationCounter).ctPauseTime, t, nSeq, Opl.item(RelaxationParameters,RelaxationCounter).minStop, Opl.item(RelaxationParameters,RelaxationCounter).maxStop, Opl.item(RelaxationParameters,RelaxationCounter).longStop, Opl.item(RelaxationParameters,RelaxationCounter).PayCreditLevel));
        cpModel.generate();
         
              RelaxationCounter++;
       
}[/i][/b]

so i want to change parameters until i find a atleast one solution.

***SettingData is a function which return a opldatasource:
[b][i]
function SettingData(cpData0, ctTripType, ctCover, ctPayCredit, ctRotation, ctDepot, ctBusType, ctPauseTime,t,  nSeq, minStop, maxStop, longStop, PayCreditLevel){
                cpData0.ctTripType=ctTripType;
cpData0.ctCover=ctCover;
cpData0.ctPayCredit=ctPayCredit;
cpData0.ctRotation=ctRotation;
cpData0.ctDepot=ctDepot;
cpData0.ctBusType=ctBusType;
cpData0.ctPauseTime=ctPauseTime;
cpData0.coverTrip = t;                     
                cpData0.nSeq=nSeq;
cpData0.minStop = minStop;
cpData0.maxStop = maxStop;
cpData0.longStop = longStop;
cpData0.PayCreditLevel=PayCreditLevel;
       
                return cpData0;
} [/i][/b]

i get the following error:
Re-generating an immutable OPL model has no effect.


what i have to do?


#CPOptimizer
#DecisionOptimization

Originally posted by: SystemAdmin

[alain.chabrier said:]

Hi,

You have to create a new IloOplModel.
You can feed it with the existing data source.

Alain
#CPOptimizer
#DecisionOptimization

Originally posted by: SystemAdmin

[shadi said:]

dear Alain

do you mean like this:
while (cpConfig.cp.solve()==false){
[b][i] var cpModel2 = cpConfig.oplModel;[/i][/b]
    cpModel2.addDataSource(SettingData(cpData0,Opl.item(RelaxationParameters,RelaxationCounter).ctTripType, Opl.item(RelaxationParameters,RelaxationCounter).ctCover, Opl.item(RelaxationParameters,RelaxationCounter).ctPayCredit, Opl.item(RelaxationParameters,RelaxationCounter).ctRotation, Opl.item(RelaxationParameters,RelaxationCounter).ctDepot, Opl.item(RelaxationParameters,RelaxationCounter).ctBusType, Opl.item(RelaxationParameters,RelaxationCounter).ctPauseTime, t, nSeq, Opl.item(RelaxationParameters,RelaxationCounter).minStop, Opl.item(RelaxationParameters,RelaxationCounter).maxStop, Opl.item(RelaxationParameters,RelaxationCounter).longStop, Opl.item(RelaxationParameters,RelaxationCounter).PayCreditLevel));
        cpModel2.generate();
  RelaxationCounter++;
       
}

***it still generate a warning:
*** WARNING[INTERFACE_060]: Ignoring duplicate data source "?".
*** WARNING[INTERFACE_009]: Re-generating an immutable OPL model has no effect.


Shadi

#CPOptimizer
#DecisionOptimization

Originally posted by: SystemAdmin

[alain.chabrier said:]

No, you should use a new IloOplModel and not a just new reference.

You might have a look in the documentation in :
ILOG OPL Development Studio 6.0 > Language > Language User’s Manual > ILOG Script for OPL > Tutorial: Flow control and column generation

or in the corresponding example cutstock_main.
This is a column generaiton examples will probably show how to handle the issues you are facing.

Hope this helps,
Alain
#CPOptimizer
#DecisionOptimization