X value in Genetic Algorithm

Hello everybody ! I'm trying to solve an optimization problem about space trajectory optimization. I have a problem concerning "x" output value of the function ga. I have 4 variables and I must minimize a defined function. The code is correct but I observed a strange thing. If I print variables value inside the code, generation after generation, and then I compare them with optimal solution after the convergence they not are the same.

The first variable is different while three other ones are coincident. Why? How can I resolve this problem? Thank you so much.

Answer 1

[Star Strider]

Although not mentioned in the documentation, there have been discussions here about the method the ga function uses to determine the ‘fittest’ individual. That is not always the fittest individual in the final generation, since the ga algorithm retains the fittest individual and uses it for the optimal result.

I invite MathWorks staff (who know those details) to add their comments.