MATLAB: Calling ga creation functions independently

creation functionsgainitial population

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?

Best Answer

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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