Calling ga creation functions independently

2018 10 5
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更新时间：2018 10 5
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Before running ga(), I would like to do some pre-analysis of the initial population. To this end, is it possible to call the default creation functions used by ga() as independent stand-alone functions?

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Stephen23
Stephen23 2018-10-5
Have you tried accessing either of them?:
https://www.mathworks.com/help/gads/genetic-algorithm-options.html#f14223
Are they on the MATLAB path, or in a private directory?
Matt J
Matt J 2018-10-5
Interestingly, gacreationuniform() is accessible, but requires input arguments that only ga() knows how to set up.

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Matt J
Matt J 2018-10-5
编辑：Matt J 2018-10-5

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Here's one method which uses a dummy call to ga() with an OutputFcn. I'm still interested to know if there's a more direct way, however.
function pop=gaPopulation(varargin)
% pop=gaPopulation(varargin)
%
%Get the initial population constructed by ga(varargin{:}).
if numel(varargin) && ...
(isa(varargin{end}, 'optim.options.GaOptions') || isstruct(varargin{end}) )
opts=varargin{end};
if isstruct(opts)
opts=gaoptimset(opts,'OutputFcn',@outputfcn);
else
opts=optimoptions(opts,'OutputFcn',@outputfcn,'Display','none');
end
varargin(end)=[];
else
opts=optimoptions(@ga,'OutputFcn',@outputfcn,'Display','none');
end
varargin(end+1:10)={[]};
pop=[];
ga(varargin{:},opts);
function [state,options,optchanged] = outputfcn(options, state,flag)
optchanged=false;
if strcmp(flag,'init')
pop=state.Population;
state.StopFlag='stop';
end
end
end

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