A separate team is generating an .lp file and we are wanting to pick it up and run variants of the problem by editing variable upper and lower bounds where we know the variable names, but not the indexes which need edited.

I see in Python, you can use cplex.variables.get_names() to get variable names after reading in the .lp file, but is there a similar method in the OPL IDE?  Java is another alternative if it can't be done through the IDE.

Thanks.

Matthew Colvin

I don't know if it can be done in the IDE, but in Java you can iterate over the elements of a model. The method IloNumVar.getName() will let you get the name of a variable. I posted some sample code in a rather old blog post, but I think the syntax has not changed.

A separate team is generating an .lp file and we are wanting to pick it up and run variants of the problem by editing variable upper and lower bounds where we know the variable names, but not the indexes which need edited.

I see in Python, you can use cplex.variables.get_names() to get variable names after reading in the .lp file, but is there a similar method in the OPL IDE?  Java is another alternative if it can't be done through the IDE.

Thanks.

Matthew Colvin

Thanks!

While the IDE would be preferable just to help other coworkers out, I can work with this.

I don't know if it can be done in the IDE, but in Java you can iterate over the elements of a model. The method IloNumVar.getName() will let you get the name of a variable. I posted some sample code in a rather old blog post, but I think the syntax has not changed.

A separate team is generating an .lp file and we are wanting to pick it up and run variants of the problem by editing variable upper and lower bounds where we know the variable names, but not the indexes which need edited.

I see in Python, you can use cplex.variables.get_names() to get variable names after reading in the .lp file, but is there a similar method in the OPL IDE?  Java is another alternative if it can't be done through the IDE.

Thanks.

Matthew Colvin

Hi,

at https://github.com/AlexFleischerParis/howtowithopl/blob/master/importlpfile.mod you can see a small example

main{  cplex.importModel("zoo.lp");  cplex.solve();  writeln("objective = ",cplex.getObjValue());  }

and in the IDE you can see lp files

Thanks!

While the IDE would be preferable just to help other coworkers out, I can work with this.

I don't know if it can be done in the IDE, but in Java you can iterate over the elements of a model. The method IloNumVar.getName() will let you get the name of a variable. I posted some sample code in a rather old blog post, but I think the syntax has not changed.

A separate team is generating an .lp file and we are wanting to pick it up and run variants of the problem by editing variable upper and lower bounds where we know the variable names, but not the indexes which need edited.

I see in Python, you can use cplex.variables.get_names() to get variable names after reading in the .lp file, but is there a similar method in the OPL IDE?  Java is another alternative if it can't be done through the IDE.

Thanks.

Matthew Colvin