why ga generates different fval and penalty values

Hello everyone, I have a question when I check the result after i using GA on my integer (binary) minimization problem that the generated fval and penalty value are not the same. Even when i tried to type like myfun(x), the result of that differs from fval and penalty value.

Also, for the penalty value, I am not sure why GA generates that because all my constraints are linear.

Thank you!

Answer 1

[Alan Weiss]

Most likely, your x value is infeasible. See Integer ga Algorithm, which states:

The penalty function value of a member of a population is:

• If the member is feasible, the penalty function is the fitness function.
• If the member is infeasible, the penalty function is the maximum fitness function among feasible members of the population, plus a sum of the constraint violations of the (infeasible) point.

Alan Weiss

MATLAB mathematical toolbox documentation