این خط خطا میده :
Gene(k)+=sum(aa(s(j,:)).*(pi(s(j,:)).^2)+b(s(j,:))  .*pi(s(j,:))+c(s(j,:)));


پیغام :
??? Error: File: sets10.m  

The expression to the left of the equals sign is not a valid target

for an assignment.

منظورت از += چیه؟