Originally posted by: Ehsan H.

I am using C# CPLEX concert tech. I want to define a Three dimensional Decision variable such as W[i][j][k] as follow:

INumVar[][][] W = new INumVar[numberOfAllNode][][];

            for (int i = 0; i < numberOfAllNode; i++) 
            {
               
              for (int j = 0; j < numberOfAllNode; j++)
              {

                      W[i][j] = cplex.NumVarArray(numberOfAllNode, 0, 1);

              }
            }

after executing the code it gives the error:  NullReferenceException in W[i][j] = cplex.NumVarArray(numberOfAllNode, 0, 1); 

Is there any method to create or modify this semi-code? 

Thank you in advance for your replies. 

Hi,

have you had a look at

https://www.ibm.com/developerworks/community/forums/html/topic?id=72c75f0e-803a-40f3-a817-2e7bf0161c69&ps=25

?

regards

https://www.linkedin.com/pulse/optimizasyon-nedir-ve-daha-az%C4%B1yla-fazla-%C5%9Fey-yapman%C4%B1za-alex-fleischer/