How to get all the history of local solvers when using multi starting point search (MultiStart)

Hi, guys.

I want to save all the history of local solver on MultiStart.

I use the code for 'OutputFcn' based on the matlab documentation like

function stop = outfun(in,optimValues,state)
     persistent history fhistory
     stop = false;
 
     switch state
         case 'init'
             history = [];
             fhistory = [];
         case 'iter'
         % Concatenate current point and objective function
         % value with history. in must be a row vector.
           fhistory = [fhistory; optimValues.fval];
           history = [history; in(:)']; % Ensure in is a row vector
         case 'done'
             assignin('base','optimhistory',history);
             assignin('base','functionhistory',fhistory);
         otherwise
     end
end

My optimization problem setting is

options = optimoptions('fmincon', 'TolFun', 1e-8, 'TolX', 1e-8, 'Display', 'iter', 'OutputFcn', @outfun);
problem = createOptimProblem('fmincon',... 
    'x0', x0, 'objective', @objf_energy_density, 'lb', Lb, 'ub', Ub,... 
    'Aeq', Aeq, 'beq', beq, 'nonlcon', @conf, 'options', options);
ms = MultiStart;
[x, F, Exitflag, Output, allmins] = run(ms, problem, 20)

When I run the optimization, I can only get the history of 'the last local solver' on MultiStart, not all the history of local solvers.

Is there any way to get all the history of local solvers when using MultiStart?

Thank you for reading my question.

Answer 1

[Walter Roberson]

             history = [];
             fhistory = [];

Do not do those.

If you want to reset the entire history for another run, then

clear outfun