Originally posted by: UMQX_Olfat_ELMahi

Hellp i am trying to solve a scheduling problem using OPL i need to recall the procblem more then one time with different data input or calling different models.

i was trying to use C++
i tried to follow info in
IBM ILOG OPL V6.3 > Language > Language User’s Manual > IBM ILOG Script for OPL > Tutorial: Flow control and multiple searches

also i tried to use the examples like mulprod.cpp but they all depend on using cplex but i am using cp

can any one send me some toutorial or example ??

Thanks
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#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

I Found two examples steelmile.cpp and carseq.cpp but they just print the whole solution :
opl.getCP().getObjValue()
opl.printSolution(cout);

but i can not find a command like :
cp.getValue() ???
Thanks
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#OPLusingCPOptimizer

Originally posted by: ChrisBr

Hello,

You might use something like:

opl.getCP().getValue(opl.getElement(
"your_variable").asIntVar());

I hope this helps,

Chris.
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#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

yes it does this is the exact command i was looking for

Thank you Thank you Thank you
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#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

another question if possible

to add integer item you use : handler.addIntItem("variable name");
to add a string you use : handler.addStringItem("variable name");
but what to do if you wand to add float number ?

thanks
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#OPLusingCPOptimizer

Originally posted by: ChrisBr

Hi,

Try

handler.startElement(
"variable name"); handler.addNumItem(value); handler.endElement();

public 

void addNumItem(IloNum value)

Chris.
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#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

thank you but i have another one "Sorry"

after i finished writing the problem and run it it gives me no solution"

---

! Satisfiability problem - 0 variables, 0 constraints
! Initial process time : 0.00s (0.00s extraction + 0.00s propagation)
! . Log search space : 0.0 (before), 0.0 (after)
! . Memory usage : 530.6 KB (before), 530.6 KB (after)
! Using parallel search with 8 workers.
!

---

! Branches Non-fixed W Branch decision
* 0 0.01s 8 -
!

---

! Search terminated normally, 1 solution found.
! Number of branches : 0
! Number of fails : 0
! Total memory usage : 807.0 KB (530.6 KB CP Optimizer + 276.4 KB Concert)
! Time spent in solve : 0.04s (0.04s engine + 0.00s extraction)
! Search speed (br. / s) : 0
!

---

with the following exception

1. exception: No Objective has been extracted by IloAlgorithm 0000000002FC2200

any idea what could be the problem ?

know that the actual problem has:

!

---

! Minimization problem - 8,946 variables, 37,100 constraints
! Preprocessing : 17,892 extractables eliminated, 17,831 constraints generated
! Initial process time : 1.76s (0.00s extraction + 1.76s propagation)
! . Log search space : 222,680.0 (before), 203,767.3 (after)
! . Memory usage : 35.5 MB (before), 44.5 MB (after)
! . Variables fixed : 252
! Using parallel search with 8 workers.
!

---

thanks again
#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: ChrisBr

Hello,

This exception is thrown when you try to get the objective value while you didn't add any objective to your model.

BTW, looking at the output you got:

! Satisfiability problem - 0 variables, 0 constraints

it seems that your model is empty.

Won't you forget to generate it?

opl.generate();

Chris.
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#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

first i really thank you for your help.

for the generation i did generate the model.

i used the following commands:
IloEnv env;
int status = 127;
try {
IloOplErrorHandler handler(env,cout);
std::istringstream in( getModelText() );
IloOplModelSource modelSource(env,in,"TestArts");
IloOplSettings settings(env,handler);
IloOplModelDefinition def(modelSource,settings);
IloCP cp(env);
IloOplModel opl(def,cp);
MyData data(env);
IloOplDataSource dataSource(&data);
opl.addDataSource(dataSource);
opl.generate();

if ( cp.solve()) {
cout << " HHHHHHHHHHHHHHHHHHHHHHHIIIIIIIIIIIIIII";
cout << endl
<< "OBJECTIVE: " << opl.getCP().getObjValue()
<< endl;
opl.postProcess();
opl.printSolution(cout);
status = 0;
} else {
cout << "No solution!" << endl;
status = 1;
}
} catch (IloOplException & e) {
cout << "### OPL exception: " << e.getMessage() << endl;
} catch( IloException & e ) {
cout << "### exception: ";
e.print(cout);
status = 2;
} catch (...) {
cout << "### UNEXPECTED ERROR ..." << endl;
status = 3;
}

env.end();

cout << endl << "Press <Enter> to exit" << endl;
getchar();

return status;

also if i change the OPL model to another simpler one it do run and get results.

but my model have alot of execute blocks before objectives is this not allowed should i transfer all calculatons to C++ and only the variables and model in the OPL or this is not the problem ??

Thanks
#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: ChrisBr

Hello,

Do you think that the problem of "//" inside c++ strings (see your other thread) explains your problem mentioned here? Or do you need more help?

Chris.
#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

yes it was thanks alot for your help i just waited to be sure.
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#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

Hello

i know i am asking alot i hope i am not annoying:
so regarding my previous question about how to access the decision variable of the model:
you adviced me to use the command :
opl.getCP().getValue(opl.getElement("your_variable").asIntVar());

the variable i used for is :
dvar int CapacityComponents in 0..3000;

and i though of start with print it out :
cout << opl.getCP().getValue(opl.getElement("Capacity").asIntVar());

it gives me the following exapcion :

OPL exception: Type dvar intComponents expected for element "Capacity"
can you help me with that ?
#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

i found out that i should use asIntMap() but i am not sure how ??
Thanks
#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

i got it but it still gives me exception it is something like that:

// in mod file
range Components = 0..nbComponents;
...
dvar int CapacityComponents in 0..3000;
//in cpp file
IloIntMap x = opl.getElement("Capacity").asIntMap();
IloSymbolSet s1 = opl.getElement("Components").asSymbolSet();

for (IloSymbolSetIterator it1(s1); it1.ok(); ++it1){
cout << x.get(*it1);
}

it through the exception :

1. OPL exception: Type range expected for element "Components".

??
#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

i got it :

IloIntMap x = opl.getElement("Capacity").asIntMap();
IloIntRange s1 = opl.getElement("Components").asIntRange();

for (IloIntRangeIterator it1(s1); it1.ok(); ++it1){
cout << x.get(*it1);
}
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#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

Hello

Sorry Again but now i am trying to get the values of one of the decision variables that defined as Var but i can not find the right get :

//.mod
dvar interval aplAct1[j in TAp1Pkt] ;

//.cpp
IloIntervalVarMap x1 = opl.getElement("aplAct1").asIntervalVarMap();
IloIntRange s11 = opl.getElement("TAp1Pkt").asIntRange();

for (IloIntRangeIterator it1(s11); it1.ok(); ++it1){
Ap1NumOfSolns[0]*it1 = x1.get(*it1);
cout << Ap1NumOfSolns[0]*it1 << " " ;
}

//error
error C2440: '=' : cannot convert from 'const IloIntervalVar' to 'int'
can you please help me

Thanks
#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

Hello

Sorry Again but now i am trying to get the values of one of the decision variables that defined as Var but i can not find the right get :

//.mod
dvar interval aplAct1[j in TAp1Pkt] ;

//.cpp
IloIntervalVarMap x1 = opl.getElement("aplAct1").asIntervalVarMap();
IloIntRange s11 = opl.getElement("TAp1Pkt").asIntRange();

for (IloIntRangeIterator it1(s11); it1.ok(); ++it1){
Ap1[NumOfSolns][0][*it1] = x1.get(*it1);
cout << Ap1[NumOfSolns][0][*it1] << " " ;
}

//error

error C2440: '=' : cannot convert from 'const IloIntervalVar' to 'int'
can you please help me

Thanks
#DecisionOptimization
#OPLusingCPOptimizer

Originally posted by: rdumeur

Dear UMQX_Olfat_ELMahi,

As stated in the documentation

http://publib.boulder.ibm.com/infocenter/cosinfoc/v12r2/index.jsp?topic=%2Filog.odms.ide.help%2Fhtml%2Frefcppopl%2Fhtml%2Fclasses%2FIloIntervalVarMap.html

The

IloIntervalVarMap::get(..)

method returns an IloIntervalVar handle, not an integer, which explains the compiler error.
Note that an IloIntervalVar object is composite, then cannot be converted into an integer value.
If you wish to access the state of an IloIntervalVar maintained by the solver, you can use several accessors available on the IloCP object:

http://publib.boulder.ibm.com/infocenter/cosinfoc/v12r2/index.jsp?topic=%2Filog.odms.cpo.help%2Fhtml%2Frefcppcpoptimizer%2Fhtml%2Fclasses%2FIloCP.html

namely:

public IloInt    getEnd(

const IloIntervalVar a) 

const 

public IloInt   getEndMax(

const IloIntervalVar a) 

const 

public IloInt        getEndMin(

const IloIntervalVar a) 

const 

public IloInt        getLength(

const IloIntervalVar a) 

const 

public IloInt        getLengthMax(

const IloIntervalVar a) 

const 

public IloInt     getLengthMin(

const IloIntervalVar a) 

const 

public IloInt     getSize(

const IloIntervalVar a) 

const 

public IloInt  getSizeMax(

const IloIntervalVar a) 

const 

public IloInt       getSizeMin(

const IloIntervalVar a) 

const 

public IloInt       getStart(

const IloIntervalVar a) 

const 

public IloInt getStartMax(

const IloIntervalVar a) 

const 

public IloInt getStartMin(

const IloIntervalVar a) 

const 

public IloBool  isAbsent(

const IloIntervalVar a) 

const 

public IloBool        isFixed(

const IloIntervalVar a) 

const 

public IloBool isPresent(

const IloIntervalVar a) 

const

which provide access to the instantiated interval var components and instantiation status.

I hope this helps,
Renaud
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#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

another Problem in retriving data
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#OPLusingCPOptimizer

Originally posted by: UMQX_Olfat_ELMahi

it did help thanks allot :
i used the following

IloIntervalVarMap x9 = opl.getElement("aplAct2CompNI").asIntervalVarMap();
IloIntRange s16 = opl.getElement("NIVrange").asIntRange();
for (IloIntRangeIterator it1(s16); it1.ok(); ++it1){
IloIntervalVar oneTrip = x9.get(*it1);
int start = cp.getStart(oneTrip);
int size = cp.getSize(oneTrip);
ap2CompNINumOfSolns[0]*it1 = start;
ap2CompNINumOfSolns[1]*it1 = size;
}
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#OPLusingCPOptimizer

Originally posted by: rdumeur

Hi,

This is indeed the right way to access the interval var state stored in the solver.
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