MATLAB: Passing parameter from the objective function to the output function

Question

Hi everyone, I would like to know how I can pass a parameter from the objective function to the output function in an optimization problem. Here is an example of what I would like to do:

options = optimset(@fminunc,'GradObj','on','Hessian','on','OutputFcn', @outfun);
[x fval] = fminunc(@rosenboth,[-1;2],options)
function [f g H extraparameter] = rosenthree(x)
% Calculate objective f, gradient g, Hessian H
f = 100*(x(2) - x(1)^2)^2 + (1-x(1))^2;
g = [-400*(x(2)-x(1)^2)*x(1)-2*(1-x(1));
        200*(x(2)-x(1)^2)];
H = [1200*x(1)^2-400*x(2)+2, -400*x(1);
            -400*x(1), 200];
extraparameter = x(1)^2 - x^(2)^3
end
function stop = outfun(x,optimValues,state, extraparameter)
     stop = false;
       switch state
           case 'init'
               hold on
           case 'iter'
           % Concatenate current point and objective function
           % value with history. x must be a row vector.
             history.fval = [history.fval; optimValues.fval];
             history.x = [history.x; x];
             history.extraparameter = [history.extraparameter; extraparameter]
             plot(history.fval, history.extraparameter)
           case 'done'
               hold off
           otherwise
       end
   end

Does anyone have an idea?? Thank you very much in advance.

Àlex

Answer 1

You can use nested functions along the lines of passing information for this other purpose.

Alan Weiss

MATLAB mathematical toolbox documentation