MATLAB: GA optimization

ga

objFcn = @(x) - sim(net,x);
[xOpt,Fval] = ga(objFcn,3);
Output of my GA is given as below:
My Fval =  -30.5182 & xOpt =  [0.1386    0.0839  0.2135  0.5449  ]
Does it mean that for my experiment the GA optimized input values are given by x and its corresponding output is Fval. My output cannot be -ve and the input values are also very low.

Best Answer

Optimization is usually expressed as looking for the minimum value. Looking for the minimum of the negative of a function is equivalent to looking for the maximum of the function.
The optimized minimum is -30.5182 but that is the optimization of the negative of the function, so the optimized maximum is 30.5182
The low value of the input values is something we do not have enough information to comment about.
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