clear;

x=0:255;
y=sin((pi*x)/256);
plot(x,y,'LineWidth',2.5)
axis([0 260 0 1.05])
grid on

a=randperm(255);
rnd_numbers=a(1:8);
fitnes=zeros(1,8);
y=inline('sin((pi*x)/256)');
fitnes=y(rnd_numbers);
sum_fitnes=sum(fitnes);
norm_fitnes=fitnes/sum_fitnes;
q=sum(norm_fitnes);

rnd_numbers, norm_fitnes

selection=[];
for i=1:8
    select_rnd=rand;
    if select_rnd<norm_fitnes(1)
        selection=[selection rnd_numbers(1)];
    elseif select_rnd<sum(norm_fitnes(1:2))
        selection=[selection rnd_numbers(2)];
    elseif select_rnd<sum(norm_fitnes(1:3))
        selection=[selection rnd_numbers(3)];
    elseif select_rnd<sum(norm_fitnes(1:4))
        selection=[selection rnd_numbers(4)];
    elseif select_rnd<sum(norm_fitnes(1:5))
        selection=[selection rnd_numbers(5)];
    elseif select_rnd<sum(norm_fitnes(1:6))
        selection=[selection rnd_numbers(6)];
    elseif select_rnd<sum(norm_fitnes(1:7))
        selection=[selection rnd_numbers(7)];
    elseif select_rnd<sum(norm_fitnes(1:8))
        selection=[selection rnd_numbers(8)];
    end
end