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Doctor Jonasz Thank you very much. It helps me a lot.

Mr.Jonasz Thanks for your reply. I'm doing a matching problem, please let me describe it in more detail. When there are 6 people, there will be a matching situation like the one shown in the figure...

Mr.Jonasz Thanks for your reply. When n is 6, I want the result of variable apij to be as follows: apij=np.array([[[0,1,0,0,0,0],[1,0,0,0,0,0],[0,0,0,1,0,0],[0,0,1,0,0,0],[0,0,0,0,0,1],[0,0,0,0,1,0...

Mr.Jonasz Thanks for your reply. This is my code. space=gurobipy.Model('matchpattern')n=6nn=15apij=space.addVars(range(1,nn+1), range(1,n+1), range(1,n+1),vtype=gurobipy.GRB.BINARY)、 space.update()...

Mr.Najman Thank you for your response. I will pay attention at next time.

Mr. Towle thank you for your reply. I will try again.

Dear Sir， That's it! I understand. Thank you very much for your answer!

  Thank you, Sir. Here is the added code. u=Model.addVar(vtype=GRB.INTEGER)Model.addConstr(quicksum((ctt[i,j])**2 for i in range(1,n+1) for j in range(1,n+1))==2*u)  

Thank you so much for the response, Sir.  I added an integer variable u and a constraint objvar=2*u . An error like " Quadratic equality constraints are non-convex. Set NonConvex parameter to 2 to ...