How do i find a difference equation?

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LeBron
LeBron 2013-1-24
I have this first order differential equation given:
i need to find a difference equation using MATLAB. I would appreciate if someone could help me with that. Thanks

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Azzi Abdelmalek
Azzi Abdelmalek 2013-1-24
Choose your sample time Te
Te=0.1 % Your sample time
N=1.5
D=[1 -0.5]
Modelc=tf(N,D) % Your continue transfer function
Modeld=c2d(Modelc,Te) % Your discrete transfer function
[Nd,Dd]=tfdata(Modeld,'v');
% From Y(z)/U(z)=Nd(z)/Dd(z) you can find the relation between y{n] and u[n]
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Roger Stafford
Roger Stafford 2013-1-25
Azzi, the Runga-Kutta method does give a set of difference equations, in fact a very respectable set indeed.
LeBron
LeBron 2013-1-25
编辑：LeBron 2013-1-25
Hey Azzi thank you so much for all your help. I really appreciate it. People like you make this forum a great place.

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