why ga generates different fval and penalty values

Question

BOWEN LI 2019-8-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477100-why-ga-generates-different-fval-and-penalty-values

回答： Alan Weiss 2019-8-22

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!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Alan Weiss 2019-8-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/477100-why-ga-generates-different-fval-and-penalty-values#answer_388661

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