GA best f(x)/ mean f(x) don't change

Hi all,

I'm using GA for optimization and my problem is that I'm getting the same best and mean value and it doesn't change after each generation (screenshot attached)

any ideas why?

I was thinking about crossover, mutation values but I'm not sure

many thanks

Nikolas

Answer 1

[Walter Roberson]

When you see a constant mean or best, but the stall generations is 0, then the implication is that one of these two things is happening:

1. the value of the function is being improved, but only after more than the 4th digit, too small a change to show up on this limited display; or
2. the algorithm is progressing by finding locations that violate constraints less . Generally speaking, the f(x) value that is accepted can even increase if the position would violate the constraints less than the previous position.

[Nikolas Spiliopoulos]

ok thanks! is there any way to see more than to digits?

[Walter Roberson]

You can use an output function; see https://www.mathworks.com/help/gads/custom-output-function-for-genetic-algorithm.html