Originally posted by: deadlock_

What I'm trying to do is to solve a model once with a given input, and then a second time with another input. The two resulting objective values should be printed on the console. Here's what I have tried so far:

dvar int x;

int y[1..1];

minimize x;
subject to {
  x >= y[1];
}

main
{

  thisOplModel.y[1] = 10;  
  thisOplModel.generate();
  cplex.solve();
  writeln(cplex.getObjValue());
  cplex.clearModel();
 
  var newModel = new IloOplModel(thisOplModel.modelDefinition, cplex);
  var newData = thisOplModel.dataElements;
  newData.y[1] = 11;
  newModel.addDataSource(newData);
  newModel.generate();
 
  cplex.solve();
  writeln(cplex.getObjValue());
}

However, I currently get the following error:

Scripting runtime error: Data element "y" does not exist.

The error seems to occur in the following line:

newData.y[1] = 11;

So it seems that addDataSource() does not work as intended.

Any help is appreciated.

Originally posted by: deadlock_

I was able to solve it myself, more or less, by loading the data from a data file instead of hardcoding it into the module. This article:

https://www.ibm.com/support/knowledgecenter/SSSA5P_12.6.1/ilog.odms.ide.help/refjsopl/html/IloOplDataElements.html

contains a working example that does everything I wanted to do, with one exception: I wanted to change an array, but the article changes a scalar value.

Hi,

have you had a look at

https://www.ibm.com/developerworks/community/forums/html/topic?id=71ac9d4e-fcc6-4ef9-a7c5-8f2a257e5cdd&ps=25

?

regards

Originally posted by: deadlock_

Weird, I wasn't able to solve my problem with an array instead of a scalar when I tried it about two weeks ago, but now it works.

Anyway, some of the things I did change was that, unlike in the code shown at the first post, I loaded the data from a separate data file and I replaced

int y[1..1];

by

int y[1..1] = …

I'm setting this topic to solved.