#61 Defining multiple problems in one program

[Anonymous]

Hi every one

I am using MOEA forr optimizing my own problem that is in nature should be solved in 2 stages,for the first stage I got satisfied results using MOEA, and now for the second stage I need to re-optimize the results that I have got from the first stage using the same steps that I have used in the first stage.

So is there any way to define multiple problems in one program ????

any suggestions will be appriciated.

Thank you

[Anonymous]

I can think of two options.

Option 1: Inside your problem definition, switch the problem definition based on how many times the evaluate method is called. This will only work if both stages use the same solution representation (the same decision variables).

private int counter = 0;

public void evaluate(Solution solution) {
    counter++;

    if (counter < 10000) {
        // stage 1
    } else {
        // stage 2
    }
}

Option 2: For stage 2, set the initial population to the solutions resulting from stage 1. See the Beginner's Guide for details on how to customize the initial population.