example5_34.m

This complete matlab for neural network

function NewChrIx = sus(FitnV,Nsel);
% FitnV-种群中每个染色体的适值
% Nsel-选择的染色体数目

[Nind,ans] = size(FitnV);
% 进行随机采样
cumfit = cumsum(FitnV);
trials = cumfit(Nind) / Nsel * (rand + (0:Nsel-1)');
Mf = cumfit(:, ones(1, Nsel));
Mt = trials(:, ones(1, Nind))';
[NewChrIx, ans] = find(Mt < Mf & [ zeros(1, Nsel); Mf(1:Nind-1, :) ] <= Mt);

%得到新的种群
[ans, shuf] = sort(rand(Nsel, 1));
NewChrIx = NewChrIx(shuf);