logistic.m

混沌模型logistc映射程序

% 产生 Logistic 序列　
% 公式模型 x(n+1) = lambda * x(n) * (1 - x(n))  

clc
clear
close all

lambda = 3:5e-4:4;
x = 0.4*ones(1,length(lambda));

N1 = 400;                   % 前面的迭代点数
N2 = 100;                   % 后面的迭代点数

f = zeros(N1+N2,length(lambda));
for i = 1:N1+N2
    x = lambda .* x .* (1 - x);
    f(i,:) = x;
end
f = f(N1+1:end,:);

plot(lambda,f,'k.','MarkerSize',1)
xlabel('\lambda')
ylabel('x');