How to extract the information in plot functions @saplotbes​tx,@saplot​bestf of Simulated annealing inside output function?

Hello,

I need to use simulated anealing as my optimization solver. Unfortunately & very sadly, I do not see 2 important pieces of information in

output function or in OptimValues structure. I noticed that such information are, instead, available in 'plot functon' and you can plot them by

a command as bellow:

options = optimoptions('simulannealbnd','PlotFcns',...

{@saplotbestx,@saplotbestf,@saplotx,@saplotf});

I DO NOT WANT TO PLOT ANYTHING. I just need to have access to the information contained in @saplotbestx,@saplotbestf. Actually, I DID expect the output function to contain such very important pieces of information.

So, my question:

How can I find the information contained in the functions @saplotbestx,@saplotbestf INSIDE output function?

I look forward to hearing from you!

Thank you!

Babak

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/gads/simulated-annealing-options.html

bestx and bestfval

[Mohammad Shojaei Arani]

Hi Walter,

But, this does not work unfortunately.

I tried both 'optimValues.bestx' and 'bestx' inside my output function in bellow. But, MATLAB throws error message.

function [stop,options,optchanged]=myoutput_SA_Parametric(optimValues,options,flag,Max_iter)

stop = false;

optchanged = false;

optimValues.bestx ----> MATLAB throws error

bestx --->MATLAB throws error

...

SOME OTHER STUFF

...

end

[Mohammad Shojaei Arani]

I am usingMATLAB 2020b. Is this the reason it does not work?

[Walter Roberson]

The calling order is

options, optimValues, flag

not

optimValues, options, flag, Max_iter

No 4th parameter is expected (or accepted), and the order of parameters is not the same as what you had.

In order to use your myoutput_SA_Parametric as coded, you would have had to have defined 'OutputFcn' as something like

@(options,optimValues,flag) myoutput_SA_Parametric(optimValues,options,flag,Max_iter)

[Mohammad Shojaei Arani]

Thanks a lot Walter!