Originally posted by: mino_901

I'm new with CPLEX and I want to write this function : 

Please i need your help :) Thank you at advance 

Please take a look at the C# examples that are shipped with CPLEX. They teach you how to use CPLEX in C#.NET.

Also look at this tutorial in the user manual.

Coding up your objective function would be something like this:

INumVar[] x = ...;
double[][] T = ...;
ILinearNumExpr expr = cplex.LinearNumExpr();
for (int j = 1; j <= n; ++j)
   for (int t = t; t <= T; ++t)
      expr.AddTerm(x[j], r[t][j] / T);
cplex.AddMaximize(expr);

Originally posted by: mino_901

Ok :) thank you very match for your help. I'll take look at this tutorial. 

Originally posted by: mino_901

Hi it's me again :$ 

I'm justing trying to make a decision variabe : y{0,1} (it can take just 0 or 1)

so i did this instruction : 

but it does not work :( 

Thank you for you help :) 

Decision variables are instances of INumVar. The fact that variables can only take integral or binary values is not expressed as a constraint but as the decision variable type.

In order to create a binary variable (that can take only values 0 and 1) use

INumVar var = cplex.BoolVar()

You may also want to take a look at these functions that create decision variables: BoolVarArray, IntVar, IntVarArray, NumVar, NumVarArray. All the above should be pretty obvious from the examples shipped with CPLEX. Did you read those examples and it still was not clear how to create decision variables?

Originally posted by: mino_901

oooh thank you it's so clear now :) thank you very match ^^ 

Originally posted by: mino_901

hi, i just have another question and i wish it will be the last :) 

i want to find a relax solution for my problem (because it's a very big probleme so cplex can't find the optimal solution) so i think that i should change cplex.solve(); but i don"t know what i have to use. 

thank you :)