How to make/create a fitness/objective function for GA problem

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Rudi Martin
Rudi Martin 2013-4-5
hello,
how do we define , or how do we make a fitness/objective function that match with our problem in GA? Are there any specific rules?
there are many fitness/objective function such as rastrigin function, ackley, griewank etc. But what if we want to use our own function? How do we create it? Based on what?

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Gavin
Gavin 2013-4-5
I have a bit of experience in this! I developed a fitness function for an extremely specific problem. In fact, I coded my own specific GA to work on a particular problem with a specific set of variables.
What sort of GA are you intending to use? The MATLAB builtin one?
What is your problem optimising, and what are the design variables?
Gav
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Rudi Martin
Rudi Martin 2013-4-6
Thanx for your response sir, my problem is actually very simple.
yes... I'm using matlab for my GA problem, but i dont know how to make my own fitness function.
It's about welding optimization. I have three parameters (design variables), each has a different limitation :
Current : 80 100 ampere
Voltage : 80 - 90 volt
Weld time : 13 - 15 second
thank you

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Shashank Prasanna
I would start with the documentation to see how to write your own objective/fitness function in MATLAB. This is however a step that comes after you already have your fitness function on paper or know what it is.
There are some examples on how to MATLAB them in MATLAB:
http://www.mathworks.com/help/optim/ug/writing-objective-functions.html#brhkghv-4
Also scroll down to see some example on how these fitness functions were created:
http://www.mathworks.com/help/gads/ga.html
That being said, you will have to come up with you specific fitness function, and GA can help find the parameters that minimize it.

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