function[]=feigenbaun(x0,a,n)
% x0 初始值 a迭代的系数 n迭代的次数
x=ones(1,2*n);
y=ones(1,2*n);
for i=1:2:2*n-1
x(i)=x0;
y(i)=a*x0*(1-x0);
x0=y(i);
x(i+1)=y(i);
y(i+1)=y(i);
end
u=0:0.001:1;
v=a*u.*(1-u);
plot(x,y,'-b',x,x,'k',u,v,'m')
end
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