select.m

matlab例子

function j=select(sum,fit)
%-------------------------
%j=select(sum,fit)
partsum=0;
j=1;
rand1=rand(1,1)*sum;
while ((partsum<rand1))%&(j<length(fit)))
   partsum=partsum+fit(j);
   j=j+1;
end
j=j-1;