How to save data from Genetic Algorithm in case MATLAB crashes?

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Hi there,
I'm using the GA to find input parameters for my model. My fitness function is computationally expensive and takes about 2 days. In situation if MATLAB unexpectedly crashes, is there a way to save the data?
I have used the 'OutputFcn' option however this seems to save the data once my MATLAB finish the simulation. I purposely stop MATLAB and re-open it but can't seem to access the saved data.
If anyone have any useful tips to save simulation data while the simulation is running so I can access in case it crashes, I would be very grateful.
Many thanks,
Syahmeer How
Syahmeer How on 16 Dec 2019
@starstrider Thank you so much :) I look forward to hearing back from you

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Accepted Answer

Star Strider
Star Strider on 17 Dec 2019
It took a bit of trial and error, however this appears to work:
function [state,options,changed] = SaveOut(options,state,flag)
file_name = 'SaveBest.mat'; % Name File
if strcmp(flag,'iter')
ibest = state.Best(end);
ibest = find(state.Score == ibest,1,'last');
bestx = state.Population(ibest,:);
previous = load('SaveBest.mat');
var = [previous.var; bestx]; % Read Previous Results, Append New Value
save(file_name, 'var') % Write ‘Best Individual’ To File
changed = true; % Necessary For Code, Use Appropriate Value
It reads the existing saved values of ‘var’, appends the new value to the end of the matrix, then writes the new matrix to the .mat file.
It never occurred to me that this was even possible! I will use it in my longer optimisations from now on.
Star Strider
Star Strider on 30 Nov 2022
Unfortunately, Shahrbanoo Shamekhi-Amiri didn’t accept it in spite of my posting a working solution.
See if that Answer solves your problem.

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