duffing3.m

duffing（多芬）混沌系统的混沌与临界混沌的图像

function dy=duffing3(t,y)
k=0.5;r=0.8;w=1;
dy=zeros(2,1);
dy(1)=y(2);
dy(2)=-k*y(2)+y(1)-y(1)^3+r*cos(w*t);