3-3.m

matlab具有强大的数值计算能力

k=60;
i=0;
r=linspace(0.2,4,100);
x=ones(1,100);
x=0.5*x
while i<=k
    xx=r.*x.*(1-x);
    x=xx;
    i=i+1;
end
plot(r,x);