Differential equation system with constant delays

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Maria Cuellar
Maria Cuellar 2020-5-25
Hello I need to solve numerically this differential equation with constants delays the history conditions are y1(t)=5 y2(t)=0.1 y3(t)=1, I tried to use dde23 with this code but there is an error:
f1=@(x,t,z)[-x(1)*z(2,2)+z(2,1);x(1)*z(2,2)-x(2);x(2)-z(2,1)]
lags=[10 1]
w=[5;0.1;1]
tspan=[0 40]
sol=ddesd(f1,lags,w,tspan);%En este caso se define función de historial
plot(sol.x,sol.y(1,:),'LineStyle','--')
hold on
plot(sol.x,sol.y(2,:),'LineStyle','-')
plot(sol.x,sol.y(3,:),'Color','g')
axis([0 1 -10 10])
xlabel('t')
legend('x','y')
And I have error
Index exceeds array bounds.
Error in Untitled>@(x,t,z)[-x(1)*z(2,2)+z(2,1);x(1)*z(2,2)-x(2);x(2)-z(2,1)]
Error in ddesd (line 147)
f0 = ddefun(t0,y0,Z0);
I appreciate your help thanks!!!

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