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Empty keys error in using optimoptions

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RUAN YY
RUAN YY on 11 Aug 2020
Commented: RUAN YY on 14 Aug 2020
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
Help! Thanks a lot!!

Accepted Answer

Aman Vyas
Aman Vyas on 14 Aug 2020
Hi,
You can re run the installer and add "Global Optimization toolbox" in your installation procedure, as this solution resolved errors for many.
Also you can take look at this answer.
Hope it helps !
Aman

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