Find the minimum of “y=x*x” using genetic algorithm in Matlab [closed]

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Closed 7 years ago.

Would somebody help me please in this question. I'm new in Matlab... And it's a bit hard for me to understand how to create and use genetic algorithm in Matlab. If anybody could help to write some very simple code for searching minimum/maximum of specified function. I read that the gatool should be used for that... but I can't understand the examples of Matlab help network. I'm doing the next steps:

1. In text editor I'm typing the next:

   function y= parabola(x)
       y=x*x;
   end
   

2. Then I'm launching the GATOOL and specifying this function like @parabola

3. Setting the number of variables (equals 2)
4. Initial range = [-10;10].

5. The other parameters are set as Default

   When I press Start Button I see a result:

   Error in fitnessfcn: Input argument "x" is undefined.