Help !! How to use Genetic Algorithm for maximisation process as it is used for minimisation process?

Question

ad aymen 2020-8-28

评论： ad aymen 2020-9-9

How to use Genetic Algorithm for maximisation process as it is used for minimisation process?

There are those who tell you other than the sign equation

but I can't change it cos it is an equation preserved by neural networks

This work improves the linear actuator so that it is sandwiched between LB and LU

I want the most value for ' y '

please help me

fitness=@fen;

nvars=2; % Number of variables

LB=[... ...]; %LB Lower bound on x

UB=[... ...]; %UB Upper bound on x

[x,y] = ga(fitness,nvars,[],[],[],[],LB,UB)

Answer 1

Star Strider 2020-8-28

Negate the fitness function to select for the maximum:

[x,y] = ga(@(x)-fitness(x),nvars,[],[],[],[],LB,UB)

Note that this assumes ‘fitness’ has only one argument.

If you are passing extra parameters, this works:

[x,y] = ga(@(x)-fitness(x,a,b),nvars,[],[],[],[],LB,UB)

where ‘a’ and ‘b’ (and perhaps others) are the extra parameters.

Star Strider 2020-8-28

As always, my pleasure!

ad aymen 2020-9-9

Can the ''y'' value be improved to be the maximum value ?

Answer 2

Gifari Zulkarnaen 2020-8-28

Make the fitness function to be 1/f(x) where f(x) is your original maximization.

ad aymen 2020-8-28

thank you