Dear Robert,

I have to solve multi-objective problem and i wrote these statements in my run file were

“Cout_Total” is the first objective

“Consommation_carburant” the second objective

option solver gurobiasl;

option gurobi_options ‘relax=1’;

option gurobi_options ‘nonconvex=2 outlev=1 presolve=2 preqlinearize=1 multiobj=1’;

solve;

let Cout_Total.objweight := 0.6;

let Consommation_carburant.objweight := 0.4;

I have had the following syntax error message:

objweight is not an assignable suffix.

context: let >>> Cout_Total.objweight <<< := 0.6;

objweight is not an assignable suffix.

context: let >>> Consommation_carburant.objweight <<< := 0.4;

I am writing to you to help me correct this.

And also I have had the following statement:

“Multi-objectives with quadratic terms are not supported

Gurobi 10.0.0: Feature not supported

Objective = Cout_Total”

So I would also like to ask you how which solver can I use to solve multi-objective problem as I am currently using Gurobi 10.0.00.

Best regards.