www.pudn.com > matlab.rar > tournSelect.m, change:1996-02-06,size:1619b

function[newPop] = tournSelect(oldPop,options) % Performs a tournament selection. % % function[newPop] = tournSelect(oldPop,options) % newPop - the new population selected from the oldPop % oldPop - the current population % options - options to normGeomSelect [gen tournament_size] % Binary and Real-Valued Simulation Evolution for Matlab % Copyright (C) 1996 C.R. Houck, J.A. Joines, M.G. Kay % % C.R. Houck, J.Joines, and M.Kay. A genetic algorithm for function % optimization: A Matlab implementation. ACM Transactions on Mathmatical % Software, Submitted 1996. % % This program is free software; you can redistribute it and/or modify % it under the terms of the GNU General Public License as published by % the Free Software Foundation; either version 1, or (at your option) % any later version. % % This program is distributed in the hope that it will be useful, % but WITHOUT ANY WARRANTY; without even the implied warranty of % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the % GNU General Public License for more details. A copy of the GNU % General Public License can be obtained from the % Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. tournSize=options(2); % Get the number of tournaments e = size(oldPop,2); % xZome length n = size(oldPop,1); % number in Population newPop = zeros(n,e); % Create the memory for newPop tourns=floor(rand(tournSize,n)*n)+1; % Schedule of tournaments % Determine the winner of the tournaments [c b]=max(reshape(oldPop(tourns,e),tournSize,n)); newPop=oldPop(diag(tourns(b,:)),:); % Copy the winners in to newPop end