nesrine - the problem is how you have defined the signature for your fitness function, fonction. Check out the documentation from MATLAB Genetic Algorithm as it relates to the function handle that you pass to ga
fitnessfcn: Handle to the fitness function. The fitness function should accept a row vector of length nvars and return a scalar value.
As described above, the fitness function accepts one input row vector of length nvars. In your case, that would be a row vector of size three. The above code has defined your fitness function to accept three inputs and NOT one. The error message Not enough input arguments is caused because the GA is passing only one input (a row vector with three elements) to your function that requires three inputs.
You just need to change your code to accept a single row vector instead of three variable inputs
function L=fonction(xData)
x1 = xData(1);
x2 = xData(2);
x3 = xData(3);
L=abs(118.04-(x1*218.46+x2*31.09+x3*125.61));
end
Try the above and see what happens!
