Hi,

I'm a PhD student trying to run multiple models in sequence with CPLEX OPL. As part of my scripting I would like to change som data between runs. This is no problem for scalars, i.e. one value parameters. But when I want to change data with multiple dimensions, I don't get it to work. I've tried googling, reading the CPLEX documentation and asking ChatGPT but I have been unsuccessful. I would be greatful if anyone could point me in the right direction. I've provided an example below. 

However I try, I get the error Data element "target" does not exist. What am I doing wrong?

My model in the file test.mod that looks like this:

Hello Patrik,

You need to add the target declaration in your test.dat file like this for instance: target = [[0,1],[1,0]];. Normally you should be able to run the test.mod file.

Regarding the main_test.mod file, I updated/simplified your code (in green).

main {

var data = new IloOplDataSource("test.dat");

var def = new IloOplModelDefinition(new IloOplModelSource("test.mod"));

var cplex = new IloCplex();

var opl = new IloOplModel(def, cplex);

opl.addDataSource(data);

//var loop = new IloOplDataElements();

data = opl.dataElements;

//var newTarget = new Array();

for (var a = 0; a <= 1; a++) {

//newTarget[a] = new Array();

for (var b = 0; b <= 1; b++) {

//newTarget[a][b] = 1;

data.target[a][b] = 1;

 }

}

//loop.target = newTarget;

//opl.addDataSource(loop);

opl.addDataSource(data);

opl.generate();

cplex.solve()

writeln(cplex.getObjValue());

writeln(opl.value);

writeln(opl.target);

opl.end();

}

Best regards,

Thanks Thierry Sola!

It works like a charm! If I understand it correctly, the data needs to be complete to be able to run the model - and, in the main flow I need to add that data first and then change som part of it?