surrogateopt: output function

How do we create a customize output function for the 'surrogateopt' that will show the solution at every iteration. I need am example for better understanding. Thank you.

Answer 1

[Alan Weiss]

Try this.

lb = [-3 -3];
ub = -lb;
opts = optimoptions('surrogateopt','OutputFcn',@listout);
obj = @(x)100*(x(2) - x(1)^2)^2 + (1 - x(1))^2;
[sol,fval] = surrogateopt(obj,lb,ub,opts)

function stop = listout(x,optimValues,state)
stop = false;
switch state
    case 'iter'
    nval = optimValues.funccount;
    y = optimValues.currentX;
    fprintf("Number of fevals = %g, x = [%g,%g]\n",nval,y(1),y(2))
end
end

Alan Weiss

MATLAB mathematical toolbox documentation

[Geopaul]

Thank you so much, it works.

[Geopaul]

How do I save these outputs( e.g nval and y) at every iterations?

[Alan Weiss]

For an example (uses different syntax, be careful) see https://www.mathworks.com/help/gads/custom-output-function-for-genetic-algorithm.html.

Alan Weiss

MATLAB mathematical toolbox documentation