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for (Map.Entry<String, GRBVar[]> varEntry : DecVariables.entrySet()) //IloIntVar[]        varEntry.getValue(). set(GRB.CharAttr.VType, GRB.CONTINUOUS); // The error message: Cannot invoke set(GRB.C...

Thank a lot. I got an error such as Cannot invoke set(GRB.CharAttr, char) on the array type GRBVar[]. Since my object is GRBVar[]. How will I make for array type GRBVar?   Thank you in advance

Okey I solved this problem thank you.

Hi Matthias, Actually, this is not a quadratic constraint. It is a method to construct an QuadExpr then another place we call this function to form objective function. My problem is that how can I ...