Empty keys error in using optimoptions

Question

RUAN YY 2020-8-11

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/577921-empty-keys-error-in-using-optimoptions

评论： RUAN YY 2020-8-14

采纳的回答： Aman Vyas

在 MATLAB Online 中打开

Hey guys! I am working on Genetic algorithm recently. And I met some problems when using fmincon.

I got error when calling the following line of code.

options = optimoptions(@fmincon,'OutputFcn',@outfun,... 
    'Display','off','Algorithm','interior-point','MaxFunEvals',budget);

It said,

Empty keys are not allowed in this container.
Error in my_fmincon (line 24)
        options =
        optimoptions(@fmincon,'OutputFcn',@outfun,... 

where budget is 10000, outfun is deined in this way:

function stop = outfun(x,optimValues,state)     
    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];
         % Concatenate current search direction with 
         % searchdir.
%            searchdir = [searchdir;... 
%                         optimValues.searchdirection'];
%            plot(x(1),x(2),'o');
         % Label points with iteration number and add title.
         % Add .15 to x(1) to separate label from plotted 'o'
%            text(x(1)+.15,x(2),... 
%                 num2str(optimValues.iteration));
%            title('Sequence of Points Computed by fmincon');
         case 'done'
             %hold off
         otherwise
     end
end