Date: Mar 24, 2014 3:42 AM
Author: Torsten
Subject: Re: Logistic equation with delay

"Adin" wrote in message <lgi88s$etr$1@newscl01ah.mathworks.com>...
> This is what I have so far:
>
> N1=zeros(201,1);
> t=zeros(201,1);
> t(1)=0;
> N1(1)=10;
> N1(2)=20;
> delta = 1;
> h=1;
>
> for i=2:200
> t(i)=i-1;
> d=(delta * t(i-1));
> N1(i+1) = N1(i) + h*N1(i)*(a-b*N1(i-d));
> end
> plot(t,N1(:,1)), grid on;
>
> But I'm getting weird plots like this: http://i.imgur.com/4NeseF6.png
>
> Any ideas what I'm doing wrong?


N1=zeros(201,1);
N1(1)=10;
N1(2)=20;
delta = 1;
h=1;
for i=2:200
N1(i+1)=N1(i)+h*N1(i)*(a-b*N1(i-delta));
end

But - as I told you - this is the discrete form of the delayed logistic equation, not the continuous form.

Best wishes
Torsten.