Use Matlab R2019a to solve integer programing , why I get warning that selection function is ignored?

Warning: Problem has integer constraints. The following options will be ignored by GA: CreationFcn SelectionFcn

Answer 1

[Walter Roberson]

When you use integer constraints then ga() implements that by using its own creation function and selection function.

If you want to have your own creation and selection functions then you need to turn off integer constraints, and instead have your creation and selection functions just happen to produce values that meet the constraints. You will probably also need to implement your own crossoverfcn.

[亚清 左]

Thank you very much! I do use its own creation function and selection function. And I choose roulette for the selection function. I don't know why my choice was ignored. Here is the problem setup.

[John D'Errico]

You have 4 variables, that each take on only binary values. Why not just evaluate the objective at each possible value, and then take the best one? Using GA to solve that problem is like using a Mack truck to carry a pea to Boston.

[亚清 左]

Yeah. You're right! I am just trying to test GA! And I have to use GA for a mixed-integer linear programming problem! But I am trapped here!