Originally posted by: Heungjo

I am trying to use Concert Technology with Java.
I read the problem instance from a MPS file.

cplex.importModel("model.mps");

After reading the problem instance, I would like to populate the matrix information to change some part of it.
Based on the API document, it seems that I have to use IloLPMatrix object.
But, I am not sure how I can get IloLPMatrix object from the active model.

Could somebody help me?

Thank you.
#CPLEXOptimizers
#DecisionOptimization

Originally posted by: SystemAdmin

You are right, the constraints will be stored as IloLPMatrix in the model after reading the model from a file. A model can comprise of multiple IloLPMatrix instances (though in your case there should only be one). To iterate over these instances use

for (Iterator it = cplex.LPMatrixIterator(); it.hasNext(); /* nothing */) {
   IloLPMatrix matrix = (IloLPMatrix)it.next();
   ...
}

Or, if you are sure that there is exactly one such instance (like in your case) just do

IloLPMatrix matrix = (IloLPMatrix)cplex.LPMatrixIterator().next();

#CPLEXOptimizers
#DecisionOptimization

Originally posted by: Heungjo

Thank you so much for fast answer.
I really appreciate that.
#CPLEXOptimizers
#DecisionOptimization