Hello!!

I am running a simulation via terminal in ubuntu, and the simulation stopped with

        Default variable names x1, x2 ... being created.

        Integer infeasible column 'x489'.

        terminate called after throwing an instance of 'NoSolutionAvailable'

x489 should be one of my variables...is there a way to translate default variables created by cplex to the original name of the variables I gave them? 

This would help in debugging...

Thanks

Sam

If you are using one of the programming APIs to create the model, there will be an option in the variable creation commands to add a name as a string. For instance, the following Java snippet creates a vector of real variables named "x" and gives each one a name.

IloCplex model = new IloCplex();// ...IloNumVar[] x = new IloNumVar[n];for (int i = 0; i < n; i++) {  x[i] = model.numVar(0, 100, "x_" + i);}

Hello!!

I am running a simulation via terminal in ubuntu, and the simulation stopped with

        Default variable names x1, x2 ... being created.

        Integer infeasible column 'x489'.

        terminate called after throwing an instance of 'NoSolutionAvailable'

x489 should be one of my variables...is there a way to translate default variables created by cplex to the original name of the variables I gave them? 

This would help in debugging...

Thanks

Sam

I am writing the model in OPL, then I read the model in a .cpp file and solve it in the .cpp file...

any suggestions on how to do it with C++?

Thank you

If you are using one of the programming APIs to create the model, there will be an option in the variable creation commands to add a name as a string. For instance, the following Java snippet creates a vector of real variables named "x" and gives each one a name.

IloCplex model = new IloCplex();// ...IloNumVar[] x = new IloNumVar[n];for (int i = 0; i < n; i++) {  x[i] = model.numVar(0, 100, "x_" + i);}

Hello!!

I am running a simulation via terminal in ubuntu, and the simulation stopped with

        Default variable names x1, x2 ... being created.

        Integer infeasible column 'x489'.

        terminate called after throwing an instance of 'NoSolutionAvailable'

x489 should be one of my variables...is there a way to translate default variables created by cplex to the original name of the variables I gave them? 

This would help in debugging...

Thanks

Sam

This probably depends on how you are building the model in OPL (and how OPL is converting it to C++). If you look up the IloNumVar class in the C++ API, you'll find constructors whose last argument is const char * name=0. If you (or OPL) is using IloNumVarArray, the constructor will not let you add names. However, once the variable array is constructed, you can loop over it and apply public void setName(const char * name) const to each array element. 

I am writing the model in OPL, then I read the model in a .cpp file and solve it in the .cpp file...

any suggestions on how to do it with C++?

Thank you

If you are using one of the programming APIs to create the model, there will be an option in the variable creation commands to add a name as a string. For instance, the following Java snippet creates a vector of real variables named "x" and gives each one a name.

IloCplex model = new IloCplex();// ...IloNumVar[] x = new IloNumVar[n];for (int i = 0; i < n; i++) {  x[i] = model.numVar(0, 100, "x_" + i);}

Hello!!

I am running a simulation via terminal in ubuntu, and the simulation stopped with

        Default variable names x1, x2 ... being created.

        Integer infeasible column 'x489'.

        terminate called after throwing an instance of 'NoSolutionAvailable'

x489 should be one of my variables...is there a way to translate default variables created by cplex to the original name of the variables I gave them? 

This would help in debugging...

Thanks

Sam

I define the variables names and constraint in the .mod file such as:
dvar float+ t[I0p1];

dvar boolean z[I0,H];

subject to 
{
    c_b:
          sum(i in I0) L[i] == 1;
};

Originally I wrote this model in AMPL using CPLEX as solver. Now I switched to IBM directly and I am having troubles rewriting the model in OPL...

This probably depends on how you are building the model in OPL (and how OPL is converting it to C++). If you look up the IloNumVar class in the C++ API, you'll find constructors whose last argument is const char * name=0. If you (or OPL) is using IloNumVarArray, the constructor will not let you add names. However, once the variable array is constructed, you can loop over it and apply public void setName(const char * name) const to each array element. 

I am writing the model in OPL, then I read the model in a .cpp file and solve it in the .cpp file...

any suggestions on how to do it with C++?

Thank you

If you are using one of the programming APIs to create the model, there will be an option in the variable creation commands to add a name as a string. For instance, the following Java snippet creates a vector of real variables named "x" and gives each one a name.

IloCplex model = new IloCplex();// ...IloNumVar[] x = new IloNumVar[n];for (int i = 0; i < n; i++) {  x[i] = model.numVar(0, 100, "x_" + i);}

Hello!!

I am running a simulation via terminal in ubuntu, and the simulation stopped with

        Default variable names x1, x2 ... being created.

        Integer infeasible column 'x489'.

        terminate called after throwing an instance of 'NoSolutionAvailable'

x489 should be one of my variables...is there a way to translate default variables created by cplex to the original name of the variables I gave them? 

This would help in debugging...

Thanks

Sam

Hi,

OPL keeps the names.

For instance https://medium.com/ibm-data-ai/optimization-simply-do-more-with-less-zoo-buses-and-kids-66940178db6

int nbKids=300;float costBus40=500;float costBus30=400; dvar int+ nbBus40;dvar int+ nbBus30; minimize costBus40*nbBus40  +nbBus30*costBus30; subject to{ 40*nbBus40+nbBus30*30>=nbKids;} 

gives the lp file

Minimize obj1: 500 nbBus40 + 400 nbBus30Subject To c1: 40 nbBus40 + 30 nbBus30 >= 300Bounds      nbBus40 >= 0      nbBus30 >= 0Generals nbBus40  nbBus30 End

I define the variables names and constraint in the .mod file such as:
dvar float+ t[I0p1];

dvar boolean z[I0,H];

subject to 
{
    c_b:
          sum(i in I0) L[i] == 1;
};

Originally I wrote this model in AMPL using CPLEX as solver. Now I switched to IBM directly and I am having troubles rewriting the model in OPL...

This probably depends on how you are building the model in OPL (and how OPL is converting it to C++). If you look up the IloNumVar class in the C++ API, you'll find constructors whose last argument is const char * name=0. If you (or OPL) is using IloNumVarArray, the constructor will not let you add names. However, once the variable array is constructed, you can loop over it and apply public void setName(const char * name) const to each array element. 

I am writing the model in OPL, then I read the model in a .cpp file and solve it in the .cpp file...

any suggestions on how to do it with C++?

Thank you

If you are using one of the programming APIs to create the model, there will be an option in the variable creation commands to add a name as a string. For instance, the following Java snippet creates a vector of real variables named "x" and gives each one a name.

IloCplex model = new IloCplex();// ...IloNumVar[] x = new IloNumVar[n];for (int i = 0; i < n; i++) {  x[i] = model.numVar(0, 100, "x_" + i);}

Hello!!

I am running a simulation via terminal in ubuntu, and the simulation stopped with

        Default variable names x1, x2 ... being created.

        Integer infeasible column 'x489'.

        terminate called after throwing an instance of 'NoSolutionAvailable'

x489 should be one of my variables...is there a way to translate default variables created by cplex to the original name of the variables I gave them? 

This would help in debugging...

Thanks

Sam

Hello! 

I guess I am doing something wrong...I wrote my model in  cyclic.mod file, data in cyclic.dat file. Then, in my .cpp file I have

      IloOplRunConfiguration rc(env, "./cyclic.mod", "./cyclic.dat");

      ...

      rc.getCplex().exportModel("cyclicModelCpp.lp");

      ...

    rc.getCplex().solve()

Is any of these passages causing the .lp file not to show the original names?

Hi,

OPL keeps the names.

For instance https://medium.com/ibm-data-ai/optimization-simply-do-more-with-less-zoo-buses-and-kids-66940178db6

int nbKids=300;float costBus40=500;float costBus30=400; dvar int+ nbBus40;dvar int+ nbBus30; minimize costBus40*nbBus40  +nbBus30*costBus30; subject to{ 40*nbBus40+nbBus30*30>=nbKids;} 

gives the lp file

Minimize obj1: 500 nbBus40 + 400 nbBus30Subject To c1: 40 nbBus40 + 30 nbBus30 >= 300Bounds      nbBus40 >= 0      nbBus30 >= 0Generals nbBus40  nbBus30 End

I define the variables names and constraint in the .mod file such as:
dvar float+ t[I0p1];

dvar boolean z[I0,H];

subject to 
{
    c_b:
          sum(i in I0) L[i] == 1;
};

Originally I wrote this model in AMPL using CPLEX as solver. Now I switched to IBM directly and I am having troubles rewriting the model in OPL...

This probably depends on how you are building the model in OPL (and how OPL is converting it to C++). If you look up the IloNumVar class in the C++ API, you'll find constructors whose last argument is const char * name=0. If you (or OPL) is using IloNumVarArray, the constructor will not let you add names. However, once the variable array is constructed, you can loop over it and apply public void setName(const char * name) const to each array element. 

I am writing the model in OPL, then I read the model in a .cpp file and solve it in the .cpp file...

any suggestions on how to do it with C++?

Thank you

If you are using one of the programming APIs to create the model, there will be an option in the variable creation commands to add a name as a string. For instance, the following Java snippet creates a vector of real variables named "x" and gives each one a name.

IloCplex model = new IloCplex();// ...IloNumVar[] x = new IloNumVar[n];for (int i = 0; i < n; i++) {  x[i] = model.numVar(0, 100, "x_" + i);}

Hello!!

I am running a simulation via terminal in ubuntu, and the simulation stopped with

        Default variable names x1, x2 ... being created.

        Integer infeasible column 'x489'.

        terminate called after throwing an instance of 'NoSolutionAvailable'

x489 should be one of my variables...is there a way to translate default variables created by cplex to the original name of the variables I gave them? 

This would help in debugging...

Thanks

Sam

See this technote : https://www.ibm.com/support/pages/display-variable-and-constraint-names-using-opl-api

You should write

IloOplSettings settings = oplF.createOplSettings(errHandler);settings.setWithNames(true);

Hello! 

I guess I am doing something wrong...I wrote my model in  cyclic.mod file, data in cyclic.dat file. Then, in my .cpp file I have

      IloOplRunConfiguration rc(env, "./cyclic.mod", "./cyclic.dat");

      ...

      rc.getCplex().exportModel("cyclicModelCpp.lp");

      ...

    rc.getCplex().solve()

Is any of these passages causing the .lp file not to show the original names?

Hi,

OPL keeps the names.

For instance https://medium.com/ibm-data-ai/optimization-simply-do-more-with-less-zoo-buses-and-kids-66940178db6

int nbKids=300;float costBus40=500;float costBus30=400; dvar int+ nbBus40;dvar int+ nbBus30; minimize costBus40*nbBus40  +nbBus30*costBus30; subject to{ 40*nbBus40+nbBus30*30>=nbKids;} 

gives the lp file

Minimize obj1: 500 nbBus40 + 400 nbBus30Subject To c1: 40 nbBus40 + 30 nbBus30 >= 300Bounds      nbBus40 >= 0      nbBus30 >= 0Generals nbBus40  nbBus30 End

I define the variables names and constraint in the .mod file such as:
dvar float+ t[I0p1];

dvar boolean z[I0,H];

subject to 
{
    c_b:
          sum(i in I0) L[i] == 1;
};

Originally I wrote this model in AMPL using CPLEX as solver. Now I switched to IBM directly and I am having troubles rewriting the model in OPL...

This probably depends on how you are building the model in OPL (and how OPL is converting it to C++). If you look up the IloNumVar class in the C++ API, you'll find constructors whose last argument is const char * name=0. If you (or OPL) is using IloNumVarArray, the constructor will not let you add names. However, once the variable array is constructed, you can loop over it and apply public void setName(const char * name) const to each array element. 

I am writing the model in OPL, then I read the model in a .cpp file and solve it in the .cpp file...

any suggestions on how to do it with C++?

Thank you

If you are using one of the programming APIs to create the model, there will be an option in the variable creation commands to add a name as a string. For instance, the following Java snippet creates a vector of real variables named "x" and gives each one a name.

IloCplex model = new IloCplex();// ...IloNumVar[] x = new IloNumVar[n];for (int i = 0; i < n; i++) {  x[i] = model.numVar(0, 100, "x_" + i);}

Hello!!

I am running a simulation via terminal in ubuntu, and the simulation stopped with

        Default variable names x1, x2 ... being created.

        Integer infeasible column 'x489'.

        terminate called after throwing an instance of 'NoSolutionAvailable'

x489 should be one of my variables...is there a way to translate default variables created by cplex to the original name of the variables I gave them? 

This would help in debugging...

Thanks

Sam