how to add one equality constraint in gravitational search algorithm?

i want use gsa for optimization, but i can't add constraint like: L(1)+L(2)+L(3)-200>=0 how i can do that?

[John D'Errico]

A minor issue is that is NOT an equality constraint. SO which is it?

Answer 1

[Matt J]

If it was supposed to be an equality constraint L(1)+L(2)+L(3)-200=0, you could eliminate one of the variables, e.g, by substituting L(1) in the objective function with

 L(1) =200-L(2)-L(3)

If you really did mean an inequality constraint L(1)+L(2)+L(3)-200>=0, you might be able to do the same kind of thing by introducing a slack variable

 L(1) =200-L(2)-L(3) + S^2