www.gusucode.com > 遗传算法 gaot工具箱matlab源码程序 > code_rar/gaot/roulette.m
function[newPop] = roulette(oldPop,options) %roulette is the traditional selection function with the probability of %surviving equal to the fittness of i / sum of the fittness of all individuals % %function[newPop] = roulette(oldPop,options) %newPop - the new population selected from the oldPop %oldPop - the current population %options - options [gen] %Get the parameters of the population numVars = size(oldPop,2); numSols = size(oldPop,1); %Generate the relative probabilites of selection totalFit = sum(oldPop(:,numVars)); prob=oldPop(:,numVars) / totalFit; prob=cumsum(prob); rNums=sort(rand(numSols,1)); %Generate random numbers %Select individuals from the oldPop to the new fitIn=1;newIn=1; while newIn<=numSols if(rNums(newIn)<prob(fitIn)) newPop(newIn,:) = oldPop(fitIn,:); newIn = newIn+1; else fitIn = fitIn + 1; end end