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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) 2008 - Yann COLLETTE <yann.collette@renault.com>
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
function [Pop_out,FObj_Pop_out,Efficiency,MO_Total_FObj_out] = selection_ga_random(Pop_in,Indiv1,Indiv2,FObj_Pop_in,FObj_Indiv1,FObj_Indiv2, ...
MO_Total_FObj_in,MO_FObj_Indiv1,MO_FObj_Indiv2,param)
[nargout,nargin] = argn();
mo_is_defined = ~isempty('MO_Total_FObj_in');
if ~isdef('param','local') then
param = [];
end
[pressure,err] = get_param(param,'pressure',0.05);
pop_size = length(Pop_in);
Total_Pop = lstcat(Pop_in, Indiv1, Indiv2);
Total_FObj = [FObj_Pop_in' FObj_Indiv1' FObj_Indiv2']';
// Normalization of the efficiency
FObj_Pop_Max = max(Total_FObj);
FObj_Pop_Min = min(Total_FObj);
Efficiency = (1 - pressure) * (FObj_Pop_Max - Total_FObj)/max([FObj_Pop_Max - FObj_Pop_Min, %eps]) + pressure;
// We select at random pop_size individuals
Index_selected = ceil((length(Total_FObj)-1)*rand(pop_size,1) + 1);
// Extraction and selection of the phenotype
FObj_Pop_out = Total_FObj(Index_selected);
// Extraction and selection of the genotype
Pop_out = list(Total_Pop(Index_selected));
// Extraction of the efficiencies
Efficiency = Efficiency(Index_selected);
// Extraction of the multiobjective values (if defined)
if mo_is_defined then
// MO_Total_FObj for multiobjective function values
MO_Total_FObj_out = [MO_Total_FObj_in' MO_FObj_Indiv1' MO_FObj_Indiv2']';
MO_Total_FObj_out = MO_Total_FObj_out(Index_selected,:);
end
Total_Pop = list(); // Reinitialisation of Total_Pop
endfunction
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